Kicker and/or

When you cast this spell, if it was kicked with its kicker, exile target artifact or enchantment an opponent controls.

When you cast this spell, if it was kicked with its kicker, return target creature an opponent controls to its owner's hand.

When Watertrap Weaver enters the battlefield, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.

When Waylaying Pirates enters the battlefield, if you control an artifact, tap target artifact or creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Flying

Ward—Discard a card. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player discards a card.)

Whenever Westgate Regent deals combat damage to a player, put that many +1/+1 counters on it.

Enchant creature

Enchanted creature can't be blocked by white creatures.

Enchanted creature gets +2/+2 as long as an opponent controls a white permanent.

Whenever a creature an opponent controls becomes the target of a spell or ability you control, gain control of that creature for as long as you control Willbreaker.

Other green creatures you control get +1/+1.

Other white creatures you control get +1/+1.

If a spell or ability an opponent controls causes you to discard Wilt-Leaf Liege, put it onto the battlefield instead of putting it into your graveyard.

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

: Add . Target opponent gains control of Witch Engine. (Activate only as an instant.)

Haste

Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.

Sacrifice another creature: Yahenni gains indestructible until end of turn.

Whenever this creature mutates, target creature an opponent controls gets -2/-2 until end of turn.