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'Flying Whenever Skysovereign enters or attacks, it deals 3 damage to target creature or planeswalker an opponent controls. Crew 3 (Tap any number of creatures you control with total power...
As an additional cost to cast this spell, behold a Merfolk and exile it. (Exile a Merfolk you control or a Merfolk card from your hand.) Whenever this creature enters...
'Svyelun has indestructible as long as you control at least two other Merfolk. Whenever Svyelun attacks, draw a card. Other Merfolk you control have ward {1}. (Whenever another Merfolk you...
'{T}: Target creature gains flying until end of turn.
Whenever you cast a blue spell, you may untap this creature.
'Nonbasic lands are Islands.
'As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped.
{T}: Add {W} or {U}.
'Destroy target nonblack creature. It can't be regenerated. You gain life equal to its toughness.
'When this creature enters, target player mills a card.
'Flying
This creature gets +1/+1 for each other creature you control with flying.
{2}{W}{U}: Create a 1/1 white Cat Bird creature token with flying.
'Vigilance
Whenever this creature enters or attacks, create a Map token. (It's an artifact with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")