First strike
Provoke (Whenever this creature attacks, you may have target creature defending player controls untap and block it if able.)

First strike, haste
Cycling (, Discard this card: Draw a card.)

All Slivers have ": Target Sliver creature gets +X/+0 until end of turn, where X is the number of Slivers on the battlefield."

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Master of the Veil is turned face up, you may turn target creature with a morph ability face down.

When Merchant of Secrets enters the battlefield, draw a card.

Flying
: Mistform Seaswift becomes the creature type of your choice until end of turn.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

All Slivers have ": This permanent becomes the creature type of your choice in addition to its other types until end of turn."

Mistform Ultimus is every creature type (even if this card isn't on the battlefield).

Flying
: Mistform Wakecaster becomes the creature type of your choice until end of turn.
, : Choose a creature type. Each creature you control becomes that type until end of turn.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Nantuko Vigilante is turned face up, destroy target artifact or enchantment.

Reach (This creature can block creatures with flying.)

Whenever Noxious Ghoul or another Zombie enters the battlefield, all non-Zombie creatures get -1/-1 until end of turn.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When Patron of the Wild is turned face up, target creature gets +3/+3 until end of turn.

When Phage the Untouchable enters the battlefield, if you didn't cast it from your hand, you lose the game.
Whenever Phage deals combat damage to a creature, destroy that creature. It can't be regenerated.
Whenever Phage deals combat damage to a player, that player loses the game.

, Exile Planar Guide: Exile all creatures. At the beginning of the next end step, return those cards to the battlefield under their owners' control.

All Sliver creatures get +0/+1.

Primal Whisperer gets +2/+2 for each face-down creature on the battlefield.
Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Flying
Cycling (, Discard this card: Draw a card.)

Flash
Any player may cast Sliver spells as though they had flash.

Double strike (This creature deals both first-strike and regular combat damage.)