Manahive

A “Mordenkainen Emblem” gives you: “You have no maximum hand size. Whenever you draw a card, you may exile target creature you control. If you do, create a token that’s a copy of that creature, except it’s not legendary and has base power and toughness equal to the number of cards in your hand.”

Closest blue equivalents:
1. “Jace, Memory Adept” Emblem

• Similar in granting extra card advantage, though not token creation.
  2. “Tamiyo, the Moon Sage” Emblem
• Provides infinite recursion from the graveyard, powerful in a similar fashion.
  3. “Niv-Mizzet, Parun”
• Blue spell that draws cards and can combo for power, but no token generation.
  4. “Stolen Identity”
• Blue spell that makes token copies of creatures.

None are identical, but these offer similar blue effects involving hand size, drawing, or token creation.