Whenever another creature you control enters, you may pay {X}{X}. If you do, put X +1/+1 counters on that creature.
{T}: Add one mana of any color.

Enchant creature
Whenever enchanted creature becomes the target of a spell or ability, put a +1/+1 counter on it and that creature deals 1 damage to each opponent. This ability triggers no more than twice each turn.

Whenever Spikemane Lion dies, you may bless target creature.

As an additional cost to cast this spell, exile two permanent cards from your graveyard.
Whenever Spikey, Jack's Gravetiller deals combat damage to a player, return a card exiled with it to its owner's hand.
You may cast Spikey from your graveyard.

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

Destroy target creature or planeswalker. Create a Treasure token.
Cycling {2}

Deathtouch

As an additional cost to cast this spell, exile any number of permanent cards from your graveyard. This spell costs {1} less to cast for each card exiled this way.
Deathtouch
When Sporeback Jargah dies, return a card exiled with it of an opponent's choice to its owner's hand.

Flying
When Squallrunner Duo enters, create a 1/1 white Human creature token.
Nontoken creatures you control that have attacked this turn have wander {2}.

{T}: Surveil 1.
{1}, {T}: Tap target creature.
{2}, {T}: Draw a card.
Flow — {3}: Untap this artifact.

Haste
Amity — Whenever you attack with Stitches and exactly one other creature, create a 2/2 Toy artifact creature token with defender, then tap all Toys you control. They're attacking.
At the beginning of your end step, if you didn't create a Toy this turn, transform Stitches.

Trample
Amity — Whenever you attack with Stitches, Orphaned and exactly one other creature, transform Stitches at the beginning of the next turn's upkeep.

Exile the top two cards of target opponent's library. You may play them until the end of your next turn, and mana of any type can be spent to cast them.

Any number of creatures you control fight different creatures you don't control. Each other creature you control gets +3/+3 and gains trample until end of turn.

Flying, vigilance
As long as this creature is on the battlefield, it has all activated abilities of cards in your graveyard. You may activate each of those abilities only once each turn.

When Suncaller Tortoise enters, return any number of lands you control to their owner's hand.
Landfall — When a land you control enters, Suncaller Tortoise deals 2 damage to target player. If it's a Mountain, it deals 3 damage instead. If it's a Plains, you gain life equal to the damage dealt. If it's a Swamp, that player discards a card.

When this creature enters, cache the top card of your library face down.

You may cast spells as though they had flash.
Whenever you cast a spell, you may tap or untap target nonland permanent.

When Survivors of the New World enters, if it isn't a token, create two tokens that are copies of it.
When Survivors of the New World dies, reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order.

Haste
Talon Triplets can't be blocked by creatures with power 2 or less.
Amity — Whenever you attack with Talon Triplets and exactly one other creature, that creature can't be blocked by creatures with power 2 or less this turn.

At the beginning of each opponent's upkeep, Teetering Panda deals 2 damage to them if they control a tapped permanent. If they control three or more, you gain 2 life and draw a card.
{2}, {T}: You may tap or untap another target creature.
{2}, {Q}: Put a stun counter on target creature.

When Teshima enters, create three 1/1 white Monk creature tokens with vigilance.
Whenever Teshima attacks, put X +1/+1 counters on each other creature you control, where X is Teshima's power.

Exalted
Whenever you attack, return target creature card from your graveyard to the battlefield tapped and attacking with a finality counter on it if it has mana value X or less, where X is the greatest power among attacking creatures you control.

Whenever The Ancient Master attacks alone, put any number of creature cards with total mana value 4 or less from your hand onto the battlefield tapped and attacking. Then return any number of creature cards with total mana value 4 or less from your graveyard to the battlefield tapped and attacking.

Flash
When The Aqua Crew enters, mill six cards, then you gain 1 life for each card type among cards in your graveyard.
Whenever you cast a spell from your graveyard, you may have target nonland permanent become an Island land. This ability triggers only once unless you control a creature named Warden of Depths.