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.

When Spirited Protest enters, create two 1/1 white Warrior creature tokens.
{1}, Sacrifice Spirited Protest: Target creature you control gains haste until end of turn.

Flying
Springsoarer enters with a +1/+1 counter on it if a creature you controlled dealt combat damage to a player this turn.
Wander {2}{U}

{2}, Sacrifice Spry Illuminator: Destroy target enchantment or noncreature artifact.

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}.

Target creature you control dares 6.

Reach
Whenever Star-Studded Sagittaur deals combat damage to a player, you may bless target land.

Exile target creature, then return that card to the battlefield under its owner's control. When you do, pay for and choose any number.
+{W} — Distribute two +1/+1 counters among one or two creatures you control.
+{C} — Exile that creature again. Return that card to the battlefield under its owner's control at the beginning of the next end step.
+{B} — All creatures get -1/-1 until end of turn.

Flying
Whenever an opponent spends mana, if it wasn't spent to cast a spell from their hand, you draw a card. This ability triggers only once each turn.

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

When Stonework Infuser enters, create a 1/1 blue Gargoyle artifact creature token with flying.

Whenever an attacking creature you control dies, Storming the Palace deals 1 damage to each opponent and you gain 1 life.
At the beginning of combat on your turn, you may pay {R/W}. If you do, create a 1/1 red and white Peasant creature token with haste and “This creature attacks each combat if able.”

Haste
When Summoning Swords enters, search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle.
Spellcharge 7

Flying
Favored
Whenever your Champion attacks, untap it.

Creatures you control get +1/+0 until end of turn.
Scry 1, then draw a card.

Choose one or both —
• Return target creature card from your graveyard to your hand.
• Return target creature card in your graveyard that was put there from the battlefield this turn to your hand.

Target creature gets -3/-3 until end of turn. If that creature would die this turn, exile it instead.

Destroy target attacking or blocking creature with power 3 or greater.

Scry 3.
Create a 1/1 colorless Thopter artifact creature token with flying.

Haste
Spellcharge 2

First strike
Cybersoul {4}{W}

When Taiga Bonder enters, put a +1/+1 counter on target creature.
Wander {3}{W}{W}

Integrate target creature or creature spell with mana value 3 or less.