When Mellan, Defense Attorney enters, make a pledge.
{T}: Choose a color from among other permanents you control. Another target creature you control gains hexproof from that color until end of turn. It can't be blocked by creatures of that color this turn.

Cast this spell only during your turn.
Target creature gets +2/+0 and gains haste until end of turn. If it's attacking, instead it gets +2/+0 and gains trample until end of turn.
Flashback {1}{R}

Target creature gains first strike and gets +X/+0 until end of turn, where X is your devotion to red.

Whenever Music Master attacks, you may pay {U}. If you do, put a curio counter on another target creature you control.
{1}{U}: Target creature gains flying until end of turn.

When Mystery Egg enters, search your library for a card and exile it face down, then shuffle your library. You may look at that card as long as it remains exiled.
{G}, {T}, Sacrifice Mystery Egg: Turn the exiled card face up. You may cast that card this turn if it's a creature spell, and you may cast that spell as though it had flash.

Gain control of target nonland permanent until end of turn. Untap it. Then you may pay {2}. If you do, gain control of that permanent until the end of your next turn.

Whenever another creature you control enters, Nomad's Companion gets +1/+1 until end of turn.

Enchant creature
Enchanted creature has “Whenever this creature deals combat damage to a player or planeswalker, scry 1, then draw a card.”

Whenever a nontoken creature you control enters, if it wasn't cast from your hand, put a +1/+1 counter on that creature.
Wander {2}{W}

When Pathetic Cocoon enters or dies, create a Berry token.

When Phenax's Touch enters, each opponent discards a card and loses 1 life.
{1}{B}, Sacrifice Phenax's Touch: You draw a card and you lose 1 life.

First strike
When Photon Collector enters, scry 2.

Amity — When you cast this spell, copy it if you attacked with exactly two creatures this turn. You may choose new targets for the copy.
Target creature gets +0/+2 and gains hexproof until end of turn.

Enchant nonland permanent
Whenever a nonland permanent you control enters, if its mana value is greater than enchanted permanent's, exile enchanted permanent.

Landfall — Whenever a land you control enters, Plucky Trainer gets +2/+2 until end of turn.

Until end of turn, target creature gains “When this creature dies, return it to the battlefield tapped under its owner's control and teach it flying.”

Vigilance
{W}, {T}: Tap target creature with power 2 or less.
Cybersoul {3}{W}

Enchant creature
Enchanted creature gets +1/+1 and can't block.
Wander {1}{B}

Target creature gets +1/+1 and gains deathtouch until end of turn. Scry 1.

Enchant creature
Enchanted creature gets -X/-X, where X is your devotion to black.

If you control three or more enchantments, damage dealt by sources you control this turn can't be prevented.
Punishment from Nyx deals 2 damage to any target.

Haste
{T}, Sacrifice Pyrote Entity: It deals 1 damage to any target.

Solidarity
{1}{R}: Choose a creature type. Ragecloak Shifter gets +2/+0 and becomes that type in addition to its other types until end of turn.

Enchant creature
Enchanted creature has menace and “Whenever this creature deals combat damage to a player, create a Treasure token.”

Menace
Creatures you control get +1/+0 if you've cast a spell that targeted Rathomar Forerunner this turn.