Whenever a creature an opponent controls dies, this creature gets +2/+0 and gains first strike and haste until end of turn.

First strike
Whenever Altaïr attacks, exile up to one target Assassin creature card from your graveyard with a memory counter on it. Then for each creature card you own in exile with a memory counter on it, create a tapped and attacking token that's a copy of it. Exile those tokens at end of combat.

Trample
Whenever Altanak becomes the target of a spell or ability an opponent controls, draw a card.
, Discard this card: Return target land card from your graveyard to the battlefield tapped.

, , Exile a creature you control: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.

As an additional cost to cast this spell, sacrifice a creature.
Search your library for a creature card, reveal it, put it into your hand, then shuffle.

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

At the beginning of the Horde's precombat main phase, reveal an additional card from the top of the Horde's library. The Horde casts that card.
Hero's Reward — When Altar of Mogis is put into a graveyard from anywhere, the Horde sacrifices two Minotaurs.

At the beginning of your first main phase, add for each charge counter on this artifact.
, : Destroy target creature. Then put a charge counter on this artifact.

Whenever another permanent you control enters, each opponent mills a card.

Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of card types among cards in all graveyards.
Lhurgoyf creatures you control have trample.

This artifact enters tapped.
: Add two mana in any combination of colors. Spend this mana only to cast spells with flashback from a graveyard.

Your devotion to each color and each combination of colors is increased by one.
: Add one mana of any color. If you control a God, a Demigod, or a legendary enchantment, you gain 1 life.

When this artifact enters, you may sacrifice a nontoken creature. If you do, draw X cards, then mill X cards, where X is that creature's power.
Craft with one or more creatures
: Return this card from your graveyard to your hand.

Exile target artifact or enchantment.

As an additional cost to cast this spell, sacrifice a creature.
Draw two cards.

Return target creature card from your graveyard to your hand. (Then exile this card. You may cast the creature later from exile.)

Change the text of target spell or permanent by replacing all instances of one color word with another. (This effect lasts indefinitely.)
Flashback

At the beginning of your end step, put a +1/+1 counter on target creature you control.

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

Nontoken creatures you control get +1/+1 and have vigilance.

Flying
Whenever Maelstrom Muse attacks, the next instant or sorcery spell you cast this turn costs less to cast, where X is Maelstrom Muse's power as this ability resolves.

Ward — Pay 3 life.
Whenever you gain life, Amalia Benavides Aguirre explores. Then destroy all other creatures if its power is exactly 20.

Affinity for Vulcans
Landfall — Whenever a land you control enters, put two +1/+1 counters on target creature you control.

Flash
Flying
Tail Spikes — When Manticore enters, destroy target creature an opponent controls that was dealt damage this turn.

Trample
Amarant Coral attacks each combat if able.
No Mercy — Whenever Amarant Coral deals combat damage to an opponent, it deals that much damage to each other opponent.

Defender
: This creature gains indestructible until end of turn.

Flying
Whenever another permanent you control enters, look at the top card of your library. If it shares a card type with that permanent, you may reveal that card and put it into your hand.