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Equivalent blue cards to Chisei, Heart of Oceans (cumulative upkeep, sacrifice a permanent, or interaction with counters for staying in play) are:
1. Serra's Sanctum – While not a creature, it's a legendary land that cares about enchantments—similar permanence/tribal synergy.
2. Linessa, Zephyr Mage – Legendary blue wizard with an activated ability that bounces creatures, not cumulative upkeep but notable for blue legends with activated abilities.
But if you want similar cumulative upkeep/requirement creatures in blue:
1. Krovikan Serpent – Cumulative upkeep with a specific sacrifice requirement.
2. Mystic Remora – Blue enchantment, cumulative upkeep (pay {1} or sacrifice).
Reason: True equivalents for sacrifice a permanent at upkeep or it dies are rare in blue, so I selected cards with similar maintenance costs, legendary status, or blue cumulative upkeep.
| Color: |  |
| Identifies: | |
| Cost: |
  |
| Rarity: | Rare |
| Converted Cost: | 4 |
| Power/Toughness: | 4/4 |
| Types: | |
| SubTypes: | |
| Languages: | 
       |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 2.16 USD / 8.27 USD |
| Cardmarket | 0.4 EUR / 2.6 EUR |
| Cardkingdom | 1.29 USD / 14.99 USD |
| Manapool | 0.88 USD / 17.49 USD |
| Color: | |
| Identifies: | |
| Cost: |
 |
| Rarity: | Rare |
| Converted Cost: | 4 |
| Power/Toughness: | 3/3 |
| Types: | |
| SubTypes: | |
| Languages: |
 |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.42 USD / 10.99 USD |
| Cardmarket | 0.32 EUR / 7.45 EUR |
| Cardkingdom | 0.99 USD / 10.99 USD |
| Manapool | 0.31 USD / 8.01 USD |
, 
: Return target creature with mana value X to its owner's hand.
Grandeur —Discardanother card named Linessa, Zephyr Mage: Target player returns a creature they control to its owner's hand, then repeats this process for an artifact, an enchantment, and a land. | Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Mythic |
| Converted Cost: | 1 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 15.58 USD / 39.05 USD |
| Cardmarket | 14.07 EUR / 32.12 EUR |
| Cardkingdom | 21.99 USD / 59.99 USD |
| Manapool | 16.39 USD / 27.34 USD |
(At the beginning of your upkeep, put an agecounteron this permanent, thensacrificeit unless you pay its upkeep cost for each agecounteron it.)
Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays 
. | Color: |  |
| Identifies: |  |
| Cost: | |
| Rarity: | Rare |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| EDH Bracket Attr: | Game Changer |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 325.95 USD |
| Cardmarket | 222.7 EUR |
| Cardkingdom | 429.99 USD |
| Manapool | 272.69 USD |
: Add for each enchantment you control. | Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Rare |
| Converted Cost: | 4 |
| Power/Toughness: | 4/4 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 2.16 USD / 8.27 USD |
| Cardmarket | 0.4 EUR / 2.6 EUR |
| Cardkingdom | 1.29 USD / 14.99 USD |
| Manapool | 0.88 USD / 17.49 USD |
| Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Rare |
| Converted Cost: | 4 |
| Power/Toughness: | 3/3 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.42 USD / 10.99 USD |
| Cardmarket | 0.32 EUR / 7.45 EUR |
| Cardkingdom | 0.99 USD / 10.99 USD |
| Manapool | 0.31 USD / 8.01 USD |
, : Return target creature with mana value X to its owner's hand.
Grandeur —Discardanother card named Linessa, Zephyr Mage: Target player returns a creature they control to its owner's hand, then repeats this process for an artifact, an enchantment, and a land. | Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Mythic |
| Converted Cost: | 1 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 15.58 USD / 39.05 USD |
| Cardmarket | 14.07 EUR / 32.12 EUR |
| Cardkingdom | 21.99 USD / 59.99 USD |
| Manapool | 16.39 USD / 27.34 USD |
(At the beginning of your upkeep, put an agecounteron this permanent, thensacrificeit unless you pay its upkeep cost for each agecounteron it.)
Whenever an opponent casts a noncreature spell, you may draw a card unless that player pays . | Color: | |
| Identifies: | |
| Cost: | |
| Rarity: | Rare |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| EDH Bracket Attr: | Game Changer |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 325.95 USD |
| Cardmarket | 222.7 EUR |
| Cardkingdom | 429.99 USD |
| Manapool | 272.69 USD |
: Add for each enchantment you control. 
