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
Flow — {3}{U}: Target player mills three cards.

Flying
When Charming Siren dies, if it wasn't blocking, you may bless target creature.

Codename: Bumblebee enters with a +1/+1 counter and a flying counter on it.
At the beginning of your upkeep, you may move a counter from Codename: Bumblebee onto another creature.

Whenever Deeptreader Arcanist attacks, you may draw a card. If you do, discard a card.

Surface {U}. Scuttling Cicada surfaces transformed.

When Tenki enters, it acclimates.
You can't sacrifice Weather enchantments.
{W}{U}{B}{R}{G}, {T}: Tenki acclimates. This ability costs one mana of any color less to activate for each Weather you control.

As long as you've cast an instant spell this turn, Teqien Overseer gets +1/+1 and has hexproof.
As long as you've cast a sorcery spell this turn, Teqien Overseer gets +1/+1 and has flying.

When Tireless Aspirants enters, you may draw a card. If you do, discard a card.
Wander {1}{U}

Flying
When this creature enters, if a nontoken creature you controlled left the battlefield without dying this turn, draw a card.
Cycling {2}

When Arduous Miners enters, you may have all players discard a card.
Whenever one or more cards leave your graveyard, create a tapped Treasure token.

Level up {3}{B}
[level 1-3] Menace
[level 4+] Menace

Lifelink
{1}{B}, {T}, Sacrifice a creature: Target opponent discards a card. Activate only as a sorcery.
{2}{B}, {T}, Exile a creature card from your graveyard: You draw a card and you lose 1 life. Activate only as a sorcery.

Flying
Whenever Capital Skyraiders deals combat damage to a player, integrate the top card of that player's library.
Capital Skyraiders gets +3/+3 as long as four or more cards are integrated onto it.

Flying
Whenever Cybat becomes tapped, you gain 1 life.

Level up {R/W}
[level 1-2] Whenever a nontoken creature you control with a counter on it dies, create a 1/1 white Citizen creature token.
[level 3+] Whenever a nontoken creature you control with a counter on it dies, create a 4/4 red Error creature token with menace.

When Grim Physician dies, target creature an opponent controls gets -1/-1 until end of turn.

Whenever you cast a multicolored spell, this creature deals 1 damage to each opponent and you gain 1 life.
When this creature dies, create a Treasure token.

Favored
Your Champion has deathtouch.

Flying, haste
Landfall — Whenever a land you control enters, put a +1/+1 counter on Pressuring Ghoul unless any opponent discards a card.

Flying
Surface {2}{B}{B}. This spell costs {1}{B}{B} less if you control a creature named Relentless Bats.
A deck can have any number of cards named Relentless Bats.

Reach
Replicrawler gets +1/+1 for each other artifact creature you control.
If you would create a token, you may pay {B}. If you do, create a token that's a copy of Replicrawler instead.

Flying
Exalted

Whenever Rooftop Slink deals combat damage to a player, you may have each player discard a card.
Cybersoul {3}{B}

Lifelink
Whenever this creature or another creature you control enters, if it entered from a graveyard or was cast from a graveyard, put two exalted counters on it.