Mogis's Raider has first strike as long as it is attacking.
When Mogis's Raider enters, bless target creature.

Indestructible
As long as your devotion to black and red is less than seven, Mogis isn't a creature.
Whenever you attack, each opponent loses 1 life for each creature attacking them. If a player lost 5 or more life this way, that player discards a card.

Ward—Sacrifice a permanent.
Whenever you cast a spell that targets Molpadia, the Last Acephali, exile the top card of your library. You may play it this turn.

Tap up to two target creatures. Put a stun counter on each of them.

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

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.

Favored
Whenever your Champion attacks, creatures you control with power 4 or greater get +1/+1 and gain trample until end of turn.

Nessian Woods enters tapped.
{T}: Add {R} or {G}.
{6}{R/G}: Nessian Woods becomes a 5/4 red and green Dryad creature with trample until end of turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to red and green. Activate only once each turn.

New Recruit has first strike as long as it is attacking.
When New Recruit dies, create a 2/2 black Zombie creature token.

Enchant creature you control
All damage that would be dealt to you is dealt to enchanted creature instead.
If a source would deal damage to enchanted creature, if you control three or more enchantments, prevent 1 of that damage.

Flash
Lifelink
When Nikon, Skophos Protector enters, 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.

Nimbus of Thought enters tapped.
{T}: Add {U} or {R}.
{4}{U/R}: Until end of turn, Nimbus of Thought becomes a 3/3 blue and red Elemental creature with “Whenever this creature becomes tapped, you may discard a card. If you do, draw a card.” It's still a land. This ability costs {X} less to activate, where X is your devotion to blue and red. Activate only once each turn.

You may cast this spell as though it had flash as long as your devotion to black is three or greater.
Scry 2, then draw two cards. You lose 2 life.

Nykthos, Architect of Gods has indestructible as long as you control at least three Shrines.
Whenever Nykthos attacks, you may pay {W}{U}{B}{R}{G}. If you do, search your library for a Shrine or legendary land card, put it onto the battlefield, then shuffle.

Put a number of +1/+1 counters on target creature equal to your devotion to green.

If you would add mana of a color to your mana pool, you may instead add an amount equal to your devotion to that color instead.

Whenever Nyxborn Retriever attacks, if defending player has eight or more cards in their graveyard, Nyxborn Retriever gets +2/+1 and gains menace 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.”

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

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

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

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.