Sacrifice an artifact: Put a +1/+1 counter on this creature.
Modular 1

Remove a +1/+1 counter from this creature: Put target artifact card from your graveyard on top of your library.
Modular 2

First strike
When this creature enters, put a +1/+1 counter on each other artifact creature you control.
Modular 2

Modular 4
Riot

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.
Modular 1

Flying
Modular 1

Menace
Modular 2
Whenever you cast a spell other than your first spell each turn, put a +1/+1 counter on this creature.

Modular — Sunburst (This enters with a +1/+1 counter on it for each color of mana spent to cast it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Flying
: This creature gets +1/+0 until end of turn.
Modular 2

Living metal
Whenever you cast a spell that targets one or more creatures or Vehicles you control, put that many +1/+1 counters on Arcee. Convert Arcee.

More Than Meets the Eye
First strike
, Remove one or more +1/+1 counters from Arcee: It deals that much damage to target creature. Convert Arcee.

Ascend
: Add .
, : Draw a card. Activate only if you have the city's blessing.

: Add .
, Sacrifice this land: Add one mana of any color.

When this creature enters, return target instant or sorcery card from your graveyard to your hand.

When this artifact enters, search your library for up to two basic Plains cards, reveal them, put them into your hand, then shuffle.
Whenever a land an opponent controls enters, if that player controls more lands than you, you may put a land card from your hand onto the battlefield.

When this artifact enters, seek two cards with flashback and put them into your graveyard.
: Add . This mana can't be spent to cast spells from your hand.

When this creature enters, return target artifact card from your graveyard to your hand.

Converge — Archaic's Agony deals X damage to target creature, where X is the number of colors of mana spent to cast this spell. Exile cards from the top of your library equal to the excess damage dealt to that creature this way. You may play those cards until the end of your next turn.

Flying, vigilance

Flash
Flying, vigilance
When Archangel Avacyn enters, creatures you control gain indestructible until end of turn.
When a non-Angel creature you control dies, transform Archangel Avacyn at the beginning of the next upkeep.

Flying
As this creature enters, each player chooses war or peace.
Creatures controlled by players who chose war get +3/+0.
Creatures controlled by players who chose peace get +0/+3.

Flying
Lifelink
Whenever you gain life, put a +1/+1 counter on each creature you control.

Flying
As long as this creature is untapped, creatures can't attack you or planeswalkers you control unless their controller pays for each of those creatures.
As long as this creature is attacking, creatures can't block unless their controller pays for each of those creatures.

Kicker and/or
Flying, lifelink
When this creature enters, if it was kicked, it deals 2 damage to any target.
When this creature enters, if it was kicked twice, it deals 2 damage to any target.

You gain 2 life for each card in your graveyard, then shuffle your graveyard into your library.