As an additional cost to cast this spell, sacrifice a creature or enchantment.
Flying
When this creature enters, each opponent sacrifices a creature of their choice, then sacrifices an enchantment of their choice.

I — Destroy any number of target artifacts with total mana value 4 or less.
II — Discard up to two cards, then draw that many cards.
III — You may sacrifice a creature. If you do, A God Divided deals damage to any target equal to the sacrificed creature's power.

Abandoned Poppet can't be blocked by creatures with power 2 or less.
Whenever a creature an opponent controls dies, they lose 2 life.

Flying, vigilance, deathtouch
Whenever Abandoner of Flesh or another transformed permanent you control dies, return that card to the battlefield.

This spell costs {1} less to cast for each creature you control.
Trample
When this creature enters, you may discard a card. If you do, draw two cards.

When Ace Tamer enters, look at the top six cards of your library. You may reveal a non-Human creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

When Adaptive Hydra enters, teach it your choice of haste, menace, or vigilance. Then repeat this process X times.

Trample
This creature gets +1/+0 for each counter among creatures you control.
{2}{R}{G}: Put a +1/+1 counter on this creature.

Whenever you cast a noncreature spell, create a 1/1 blue Bird creature token with flying.
Flow — {10}{W}{U}: Draw cards equal to half the number of cards in your library, rounded up.

Aethersteel Pouncer enters with a haste counter on it.

Ward {2}
If you would put one or more counters on a permanent or player, put three times as many of each of those kinds of counters on that permanent or player instead.

Flash
When Agent of Deception enters, counter target creature or planeswalker spell unless its controller pays {X}, where X is your devotion to blue.

Flying, deathtouch

Aggressor Model enters with a +1/+1 counter on it.

Vigilance
Whenever another creature you control dies, return to your hand target enchantment card from your graveyard with lesser mana value.

Flying, vigilance
Other creatures you control are Armies in addition to their other types.
At the beginning of your end step, create a 0/0 white Army creature token, then put a +1/+1 counter on each Army you control.

Trample
Whenever a creature you control attacks alone, put four +1/+1 counters on it.

Ward {2}
Whenever one or more nontoken creatures you control leave the battlefield without dying, create a 1/1 blue Ninja creature token with “This creature can't be blocked by creatures with greater power.”

Menace, lifelink
Whenever a tapped creature you control dies, draw a card.

Whenever you cast a spell, if mana from an artifact source was spent to cast it, you may copy that spell, and you may choose new targets for the copy. Do this only once each turn.

Whenever a player attacks with two or more creatures, create a Treasure token.
Whenever a player casts their second spell each turn, create a 1/1 colorless Cyborg artifact creature token.
Cybersoul {7}{W}{B}

Enchant creature
Enchanted creature gets +2/+0 and has “Attacking creatures you control get +1/+0.”
Wander {2}{R}

Whenever you cast a spell that targets Alranta Patrol, create a 1/1 white Human creature token. If Alranta Patrol is attacking, that token enters tapped and attacking.

Alranta Portalmage can't be blocked as long as a creature you control entered this turn.
If a creature you control entering the battlefield would cause an ability of a permanent you control to trigger, that ability triggers an additional time.

Trample
{T}, Pay 1 life: Add {C}.
Whenever Alranta Unleashed deals combat damage to a player, untap each Ruin you control. They become creatures in addition to their other types until the end of your next turn.
Spellcharge 6