Terrain Generator

{T}: Add {C}.
{2}, {T}: You may put a basic land card from your hand onto the battlefield tapped.

Darting Merfolk

{U}: Return this creature to its owner's hand.

Return target creature to its owner's hand.

When this creature enters, each opponent sacrifices a permanent of their choice unless they pay {1}.

Whenever you cast a creature spell, you may pay {1}. If you do, return target creature to its owner's hand.

You may return two Islands you control to their owner's hand rather than pay this spell's mana cost.
Draw two cards.

Whenever an opponent casts a spell, you may draw a card unless that player pays {1}.

{U}: Tap target creature unless its controller pays {1}.

Return target creature to its owner's hand. Then return another target creature to its owner's hand unless its controller pays {1}.

Draw three cards. Then if any player pays {2}, discard three cards.

When this creature enters, each opponent sacrifices a permanent of their choice unless they pay {2}.