Echoing Cavern

Vigilance When this creature enters, draft a card from Adaptive Armorer's spellbook and put it onto the battlefield. When an Equipment enters this way, attach it to target creature you control.

The first Merfolk spell you cast each turn has convoke. At the beginning of your end step, if you control two or more tapped creatures, conjure a card named Stonybrook Schoolmaster onto the battlefield tapped.

Choose one — • Seek a Kithkin card. At the beginning of the next end step, if that card is in your hand, exile it. • Creature cards in your hand perpetually get +1/+1.

Draw two cards, then put two cards from your hand on the bottom of your library in any order. Blue creature cards in your hand perpetually gain "Evoke—Exile a blue card from your hand."

When this artifact enters, conjure a card named Ponder into your hand. Whenever one or more Merfolk you control deal combat damage to a player, sacrifice this artifact. If you do, conjure a card named Flooded Strand into your hand.

When this creature enters, you get a one-time boon with "When you cast an instant or sorcery spell with mana value 3 or less, copy it. You may choose new targets for the copy."

Flying Double team Whenever you cast a spell during an opponent's turn, draft a card from Thoughtsteal Sprites's spellbook, then discard a card. This ability triggers only once each turn.

When this enchantment enters, creature cards in your graveyard perpetually get +1/+1. Blight X, Return this enchantment to its owner's hand: Return target creature card with mana value X or less from your graveyard to the battlefield. X can't be greater than the greatest toughness among creatures you control. Activate only as a sorcery.