Flash
When Agent of Deception enters the battlefield, counter target creature or planeswalker spell unless its controller pays {X}, where X is your devotion to blue.

At the beginning of each opponent's upkeep, that player may pay life equal to the number of pain counters they have plus 1. If they don't, look at their hand, choose a card from it, and exile that card. If they do, that player gets a pain counter.
You may cast cards exiled with Alehana, and mana of any type can be spent to cast them.

Vigilance
Drop — Whenever Avatar of the Festival or another creature enters the battlefield under your control, if the entering creature was cast and you didn't cast any creature spells during your last turn, you may have your life total become the total power and toughness of creatures you control.

As Bind in Silence enters the battlefield, choose a nonland card name.
Spells with the chosen name can't be cast.
When Bind in Silence is put into a graveyard from the battlefield, your opponents can't cast spells this turn.

All spells cost {1} more to cast.
Spellcharge 6

{T}, Exile an instant or sorcery card from your graveyard: Add one mana of any type.
Once each turn, when you cast an instant or sorcery spell, you may create a 1/1 colorless Construct artifact creature token.

Multitude {4}{W}{W}
When Drift Off enters the battlefield, exile target nonland permanent you don't control until Drift Off leaves the battlefield.

Flash
Prowess
When Ella enters the battlefield, create two 1/1 blue Wizard creature tokens with prowess.
Whenever you cast a noncreature spell, you may sacrifice a creature. If you do, copy that spell. You may choose new targets for the copy.

When Elvish Visionary enters the battlefield, draw a card.

Indestructible
As long as your devotion to white and blue is less than seven, Ephara isn't a creature.
Whenever you cast an enchantment spell, draw a card.

{T}, Sacrifice Evolving Wilds: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Search your library for a noncreature, nonland card not named Get Your Wish, reveal it, put it into your hand, then shuffle.
You may cast a spell with mana value X or less from your hand without paying its mana cost, where X is the number of colors among permanents you control.

Look at the top seven cards of your library. You may put an artifact card, a creature card, an enchantment card, a land card, and/or a planeswalker card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

Exile the top card of your library. You may play that card this turn.
Flashback {R}

Flying
Whenever Irrlicht deals combat damage to a player, they reveal their hand and you choose a nonland card from it. Exile that card until your next turn.

Whenever you draw a card, each opponent loses 1 life and you gain 1 life.
{T}: Each player draws a card.
{2}, {T}: Draw a card.

Moresso, Infuser of Light is all colors.
Hexproof from monocolored
Whenever you cast a spell with four or more mana symbols in its mana cost, add four mana of different colors. This ability triggers only once each turn.

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 Necrotic Savant enters the battlefield, return target creature card from your graveyard to the battlefield if it has mana value 3 or less or if Necrotic Savant escaped.
Escape—{5}{B}{B}, Sacrifice two permanents, Exile five other cards from your graveyard.

Flash
Lifelink
When Nikon, Skophos Protector enters the battlefield, the next time a source of your choice would deal damage to you or a permanent you control this turn, prevent that damage. If damage is prevented this way, Nikon deals that much damage to that source's controller.

Whenever another creature enters the battlefield under your control, 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.”