As an additional cost to cast this spell, discard X cards.
Look at target opponent's hand and choose X cards from it. That player discards those cards.

First strike
: Target creature gains first strike until end of turn.

Destroy target artifact, creature, or land. Aftershock deals 3 damage to you.

Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power.

Any player may cast creature spells with converted mana cost 3 or less without paying their mana costs and as though they had flash.

At the beginning of each player's upkeep, Ancient Runes deals damage to that player equal to the number of artifacts they control.

: Add . Ancient Tomb deals 2 damage to you.

Flying
Whenever Angelic Protector becomes the target of a spell or ability, Angelic Protector gets +0/+3 until end of turn.

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Prevent the next 3 damage that would be dealt to target creature this turn.

Whenever Apes of Rath attacks, it doesn't untap during its controller's next untap step.

Exile all permanents. You discard your hand.

All Sliver creatures have ": This creature gets +0/+1 until end of turn."

Flying

Sacrifice an enchantment: Auratog gets +2/+2 until end of turn.

Flying
When Avenging Angel dies, you may put it on top of its owner's library.

All Sliver creatures have ": This creature gets +1/+0 until end of turn."

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

Flying
Whenever Bellowing Fiend deals damage to a creature, Bellowing Fiend deals 3 damage to that creature's controller and 3 damage to you.

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Cast this spell only before the combat damage step.
Target attacking or blocking creature gets +4/+0 until end of turn. Destroy that creature at the beginning of the next end step.