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Equivalent cards (similar effect: copying creatures, blue/green):
1. Quasiduplicate (Blue, makes a token copy of a creature)
2. Cackling Counterpart (Blue, instant, makes a token copy)
3. Essence Flux (Blue, blinks a creature, not a copy but often used similarly)
4. Spark Double (Blue, enters as a copy and gets a counter if it's copying a creature)
5. Altered Ego (Blue/Green, enters as a copy with extra +1/+1 counters)
Reason: These cards can copy creatures like Elvish Hydromancer does.
