Mykian, Pop Paragon enters with a +1/+1 counter on it for each color of mana spent to cast it.
Remove two counters from Mykian: Draw two cards.

Flying
When Skylance Escort enters, put a vigilance counter on each creature you control.

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

Whenever Freightyard Scrappers attacks, create a Treasure token.
{X}, Sacrifice an artifact: Return target artifact card with mana value X or less from your graveyard to the battlefield. Activate only as a sorcery and only once each turn.

When Sola enters, create a Treasure token.
{2}, Sacrifice a Treasure: You gain 3 life.
{2}, Sacrifice a Treasure: Draw a card.

Trample
Other creatures have base power and toughness 3/3.
At the beginning of your end step, sacrifice Eo unless you attacked this turn.

When Sillaman Ambassador enters, put a +1/+1 counter on each of up to three target creatures you control.
Basic landcycling {1}{W}

When Leyspark Wielder enters, if you cast it, add {G}{U}{R}. Spend this mana only to cast instant or sorcery spells.
Whenever you cast an instant or sorcery spell, target creature gets +1/+1 and gains trample and haste until end of turn.

Whenever Chamille, AAA-Lister attacks, target nonlegendary creature can't block it this turn.
Whenever Chamille deals combat damage to a player, put a +1/+1 counter on it, then create a Treasure token for each counter on it.

Whenever Forgotten Cultivator enters or attacks, mill three cards. Return a permanent card from among the milled cards to your hand.
Spellcharge 4

Indulgence
Whenever you indulge, create a tapped token that's a copy of Pagentry Golem.

Flash
Whenever you cast a noncreature spell, Prismatic Pack gets +1/+1 until end of turn. Untap it.

Whenever one or more creatures crew Smuggler's Convoy, you may move any number of counters from those creatures to Smuggler's Convoy.
Crew 1

{T}: Add {C}.
Whenever Unwavering Gates attacks, other creatures you control gain indestructible until end of turn.
Spellcharge 5

When Cliffwalker enters, return a permanent you control to its owner's hand.
Wander {1}{W}

Flying
{2}, Discard Fiefwatcher Gargoyle: Search your library for a basic Plains card, reveal it, put it into your hand, then shuffle.

When Retrofit Paladin enters, tap up to two target creatures with power 3 or less.

Ward {1}
When Transfixing Troupe enters, exile target creature an opponent controls until Transfixing Troupe leaves the battlefield.

Ward {2}
At the beginning of your end step, if it's not an extra turn and you've cast three or more instant or sorcery spells with different mana values this turn, take an extra turn after this one.

When Avatar of Brilliance enters, you may cast target instant or sorcery card in your graveyard with mana value X or less without paying its mana cost, where X is the number of differently named lands you control. If that spell would be put into your graveyard this turn, exile it instead.

Flying
When Breaching Jaxl enters, untap target nonland permanent.
Wander {2}{U}

Flying
Creatures you control but don't own get +1/+1 and have flying.
Whenever a creature you control deals combat damage to a player, you may return it to its owner's hand.

Flash
When Sanctum of the Two Truths enters, draw two cards.
Spellcharge 4

Flying
Drop — When Sphinx of the Soundveins enters, if you didn't cast any creature spells during your last turn, untap up to three lands.

Tidewake Walker enters with a hexproof counter on it.