Each opponent can't draw more than one card each turn.

Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card.

Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card. You may draw an additional card if Rayne is enchanted.

Whenever an opponent attacks one or more planeswalkers you control, put a loyalty counter on each planeswalker you control.

Whenever a permanent you control becomes the target of a spell or ability an opponent controls, you may draw a card.

Whenever another permanent you control becomes the target of a spell or ability an opponent controls, you may return that permanent to its owner's hand.

Whenever an opponent casts a spell that targets you or a creature you control, you may draw a card.

Flying

Whenever this creature becomes the target of a spell you control, draw a card.

When Gadwick enters, draw X cards.

Whenever you cast a blue spell, tap target nonland permanent an opponent controls.

Changeling (This card is every creature type.)

Whenever you or a permanent you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays .

Sliver creatures you control have "When this creature enters, goad target creature an opponent controls." (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Whenever a Sliver creature you control becomes the target of a spell or ability an opponent controls, counter that spell or ability unless its controller pays .

Inspired — Whenever this creature becomes untapped, you may exchange control of target nonland permanent you control and target permanent an opponent controls that shares a card type with it.

All Slivers have ", Sacrifice this permanent: Draw a card."

Whenever you cast a historic spell, tap target creature an opponent controls. (Artifacts, legendaries, and Sagas are historic.)

All Sliver creatures have defender.

All Slivers have "When this permanent enters, draw a card."

Flash

Valiant — Whenever this creature becomes the target of a spell or ability you control for the first time each turn, tap target creature an opponent controls.

This creature can't be blocked by red creatures.

When this creature enters or becomes the target of a spell or ability an opponent controls, you gain 3 life.

Whenever another Human you control enters, untap this creature.

, : You may tap or untap target permanent.

Whenever another snow permanent you control enters, you may have target player mill two cards.