Control u/r

Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.

Return up to three target artifacts and/or creatures to their owners' hands.

You may cast a spell with mana value 4 or less from your hand without paying its mana cost.

Instant and sorcery spells you cast cost {1} less to cast.

Whenever a spell or ability you control counters a spell, you may draw a card. If you do, discard a card.

Bolt of Keranos deals 3 damage to any target. Scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

[+1]: Exile the top card of your library. You may cast that card. If you don't, Chandra, Torch of Defiance deals 2 damage to each opponent.

[+1]: Add {R}{R}.

[−3]: Chandra, Torch of Defiance deals 4 damage to target creature.

[−7]: You get an emblem with "Whenever you cast a spell, this emblem deals 5 damage to any target."

{U/R}{U/R}, {T}, Tap two untapped red creatures you control: Crackleburr deals 3 damage to any target.

{U/R}{U/R}, {Q}, Untap two tapped blue creatures you control: Return target creature to its owner's hand. ({Q} is the untap symbol.)

[+1]: Target player draws two cards, then discards two cards.

[−2]: Gain control of target artifact.

[−6]: You get an emblem with "Whenever you cast a spell that targets one or more permanents, gain control of those permanents."

Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)

Scry 4, then draw two cards.

({T}: Add {U}.)

[+2]: Look at the top card of target player's library. You may put that card on the bottom of that player's library.

[0]: Draw three cards, then put two cards from your hand on top of your library in any order.

[−1]: Return target creature to its owner's hand.

[−12]: Exile all cards from target player's library, then that player shuffles their hand into their library.

[+1]: Scry 1, then draw a card.

[−2]: Return target creature to its owner's hand.

[−8]: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell."

{2}, Exile a nonland card from your hand: Put four time counters on the exiled card. If it doesn't have suspend, it gains suspend. (At the beginning of your upkeep, remove a time counter from that card. When the last is removed, cast it without paying its mana cost. If it's a creature, it has haste.)

Indestructible

As long as your devotion to blue and red is less than seven, Keranos isn't a creature.

Reveal the first card you draw on each of your turns. Whenever you reveal a land card this way, draw a card. Whenever you reveal a nonland card this way, Keranos deals 3 damage to any target.

{1}{U}{U}: Target permanent becomes an artifact in addition to its other types. (This effect lasts indefinitely.)

{3}{U}: Gain control of target artifact. (This effect lasts indefinitely.)

Whenever you cast an instant or sorcery spell with mana value greater than the number of experience counters you have, you get an experience counter.

Instant and sorcery spells you cast cost {1} less to cast for each experience counter you have.

({T}: Add {R}.)

Buyback {2} (You may pay an additional {2} as you cast this spell. If you do, put this card into your hand as it resolves.)

Scry 3. (Look at the top three cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Counter target noncreature spell.

Flying

Whenever Niv-Mizzet, Dracogenius deals damage to a player, you may draw a card.

{U}{R}: Niv-Mizzet, Dracogenius deals 1 damage to any target.

Flying

Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to any target.

{T}: Draw a card.

[+1]: Tap target permanent, then untap another target permanent.

[−2]: Ral Zarek deals 3 damage to any target.

[−7]: Flip five coins. Take an extra turn after this one for each coin that comes up heads.

Flying, trample

Spellheart Chimera's power is equal to the number of instant and sorcery cards in your graveyard.

{1}: Untap Staff of Domination.

{2}, {T}: You gain 1 life.

{3}, {T}: Untap target creature.

{4}, {T}: Tap target creature.

{5}, {T}: Draw a card.

Temple of Epiphany enters the battlefield tapped.

When Temple of Epiphany enters the battlefield, scry 1.

{T}: Add {U} or {R}.

Devoid (This card has no color.)

Counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Wandering Fumarole enters the battlefield tapped.

{T}: Add {U} or {R}.

{2}{U}{R}: Until end of turn, Wandering Fumarole becomes a 1/4 blue and red Elemental creature with "{0}: Switch this creature's power and toughness until end of turn." It's still a land.