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.

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

When Elvish Visionary enters the battlefield, draw a card.

Enchant land
Enchanted land has “{T}: Add {G}{G}.”

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

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}

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.

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.”

Flash
When Omen of Slaughter enters the battlefield, each opponent sacrifices a creature or planeswalker.
{2}{B}, Sacrifice Omen of Slaughter: Scry 2.

Vigilance
Whenever you attack, bless target creature.

Flash
When Primordial of Emila Glade enters the battlefield, return up to two instant and/or sorcery cards from your graveyard to your hand.
Once each turn, you may pay {U} rather than pay the mana cost for an instant or sorcery spell.

When Rano's Slopeguard enters the battlefield, you may exile cards from the top of your library until you exile a nonland card with mana value 2 or less, then put the rest on the bottom in a random order. You may cast the exiled card this turn.

Target opponent discards their hand, then draws seven cards. You discard your hand, then exile the top seven cards of that player's library. You may play those cards as long as they remain exiled, and mana of any type can be spent to cast them.