Destroy target creature if it has fewer colors than the number of colors of mana spent to cast this spell.

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

Flying
Odunos Smuggler can't block.
When Odunos Smuggler enters, target player mills two cards. Scry 2.

At the beginning of your upkeep, integrate the top card of target player's library.
Whenever a creature card is integrated onto Offerings to Sky Gods, create a 1/1 colorless Cyborg artifact creature token.

Look at the top X cards of your library, where X is one plus the number of differently named lands you control. Put up to three of them into your hand and the rest on the bottom of your library in a random order.

Whenever an enchantment you control enters, each opponent mills two cards.

Whenever an enchantment you control enters, tap target noncreature permanent.

During your turn, you may play cards from your graveyard but not from anywhere else.
Whenever you cast an instant or sorcery spell, exile that card instead of putting it into your graveyard as it resolves.
If another permanent you control would be put into your graveyard, exile it instead.

Trample
Amity — Whenever Old-Growth Gecko attacks, put a +1/+1 counter on another creature you control. If exactly one other creature attacked with it, this ability triggers three times instead.

Flash
When Omen of Deception enters, counter target spell unless its controller pays {2}.
{2}{U}, Sacrifice Omen of Deception: Scry 2.

Flash
When Omen of Horizons enters, put two +1/+1 counters on target creature you control.
{2}{G}, Sacrifice Omen of Horizons: Scry 2.

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

Flash
When Omen of Storms enters, discard a card, then draw two cards.
{2}{R}, Sacrifice Omen of Storms: Scry 2.

Flash
When Omen of Victory enters, create a 0/0 white Army creature token, then put two +1/+1 counters on it.
{2}{W}, Sacrifice Omen of Victory: Scry 2.

Flying, first strike, lifelink
Landfall — Whenever a land you control enters, other creatures you control get +2/+2 until end of turn.

First strike
Landfall — Whenever a land you control enters, other creatures you control get +1/+1 until end of turn.
{2}{R}{W}{B}: Transform Omenhorn.

Your maximum hand size is zero.
Pay 1 life: Draw a card. Activate only as a sorcery.

Whenever Omnoid Destroyer or another artifact you control enters, artifact creatures you control gain deathtouch until end of turn.

Create three 1/1 red and green Elemental creature tokens.

Whenever Opal-Eye Allseer enters or you cast a noncreature spell, create a 1/1 white Bird creature token with flying.
Wander—{1}{U}, Exile two instant and/or sorcery cards from your graveyard.

When Opal-Eye Caretaker enters, put a +1/+1 counter on each creature you control that entered this turn and wasn't cast from your hand.
Wander {1}{W}

Flying, haste
As an additional cost to cast spells with flashback, you may pay {1}{R}. When you do, return Opal-Eye Phoenix from your graveyard to the battlefield.

Whenever you spend at least five mana to cast a spell, untap Opal-Eye Runeweaver.
{T}: Untap another target permanent not named Opal-Eye Runeweaver. Activate only as a sorcery.

When Opulent Roughrider enters or leaves the battlefield, surveil 1, then you may reveal the top card of your library. If that card has the same name as a permanent you control or a card in your graveyard, put it into your hand.
Wander {4}{U}{U}

Vigilance
Whenever you attack, bless target creature.