Have

Impulse

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Each player can't cast more than one spell each turn.

Search your library for a creature card, reveal it, then shuffle and put the card on top.

{T}: Add {C}.
{T}: Add {G} or {U}. Yavimaya Coast deals 1 damage to you.

When an opponent casts an instant spell, if Hidden Gibbons is an enchantment, Hidden Gibbons becomes a 4/4 Ape creature.

Each player returns a creature they control to its owner's hand.

{T}, Sacrifice Tormod's Crypt: Exile target player's graveyard.

Counter target spell unless its controller pays {3}.

Return all creatures to their owners' hands.

Flying
Whenever Xantid Swarm attacks, defending player can't cast spells this turn.

You may return an Island you control to its owner's hand rather than pay this spell's mana cost.
Counter target spell unless its controller pays {1}.

Return target permanent to its owner's hand.

Exile Elvish Spirit Guide from your hand: Add {G}.

At the beginning of each player's upkeep, that player returns a creature they control to its owner's hand.

Return target creature to its owner's hand. Untap up to two lands.

Return all green permanents to their owners' hands.

When Uktabi Orangutan enters, destroy target artifact.

Players can cast spells and activate abilities only during their own turns.

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

Flash
When Mystic Snake enters, counter target spell.