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.

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.

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.

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

Favored
Whenever your Champion deals combat damage to a player, create that many Treasure tokens.

{T}: Draw a card, then discard a card.
Once each turn, when you cast a spell from your graveyard, you may create a 2/1 blue Human Pirate creature token.
Crew 2

Flying
When Archon of Condemnation enters, you may bless target creature.
At the beginning of your upkeep, you may sacrifice a creature. If you do, bless target creature.

Menace
Whenever you cast an artifact spell, each opponent loses 2 life.

Menace
When Askir enters, each opponent loses life equal to the amount of life they've lost this turn.
Wander—{1}{B}{B}, Pay 4 life.

Vigilance, lifelink
Ward—{2}, Pay 2 life.
Azantium, Perfect Creation has all activated abilities and triggered abilities of other artifacts you control.

{2}, Sacrifice a creature: Teach target creature menace.

Whenever an attacking creature you control dies, Bleeding Edge Memorial deals 1 damage to defending player.
Spellcharge 4

At the beginning of your upkeep, create a Treasure token.
Whenever you sacrifice an artifact or enchantment, this creature deals 1 damage to each opponent.

Bouncers-for-Hire can't attack unless you control a red permanent.

Ninjutsu {2}{G}
When this creature enters, another target creature you control gains indestructible until end of turn. Untap it.

Vigilance
Whenever Builder of Monuments attacks, put a build counter on it. Then you may search your library for an artifact or enchantment card with mana value less than or equal to the number of build counters on Builder of Monuments, put that card onto the battlefield, then shuffle.

Level up {3}
[level 2-5] Vigilance
[level 6+] Vigilance, indestructible

Trample
When Canopy Creeper enters, create two Berry tokens.

Trample
When Centaur Mentor enters, target creature gets +X/+0 until end of turn, where X is your devotion to green.

Flying
Whenever Chief Executive Dhante enters or attacks, create a Treasure token, then you may pay {X}. Spend only mana from artifact sources, and X can't be 0. When you do, destroy target nonland permanent with mana value X or less.

As an additional cost to cast this spell, sacrifice any number of creatures, then exile any number of creature cards from your graveyard. This spell costs {2} less to cast for each card or token sacrificed or exiled this way.
Flying

If you would create one or more artifact tokens, instead create those tokens plus an additional Treasure token.
{2}{R}, Sacrifice X artifacts: This creature gets +X/+0 until end of turn.