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As Tablet of the Guilds enters the battlefield, choose two colors. Whenever you cast a spell, if it's at least one of the chosen colors, you gain ...

{T}: Add {G} or {W}. {G}{W}: Selesnya Keyrune becomes a 3/3 green and white Wolf artifact creature until end of turn.

{T}: Add {B} or {R}. {B}{R}: Rakdos Keyrune becomes a 3/1 black and red Devil artifact creature with first strike until end of turn.

As Pithing Needle enters the battlefield, choose a card name. Activated abilities of sources with the chosen name can't be activated unless they'r...

{T}: Add {U} or {R}. {U}{R}: Until end of turn, Izzet Keyrune becomes a 2/1 blue and red Elemental artifact creature. Whenever Izzet Keyrune deals ...

Enchant nonland permanent At the beginning of the upkeep of enchanted permanent's controller, that player sacrifices it unless they pay {X}, where...

Lands you control have "{T}: Add one mana of any color." {T}: Add one mana of any color.

{T}: Add {B} or {G}. {B}{G}: Golgari Keyrune becomes a 2/2 black and green Insect artifact creature with deathtouch until end of turn.

{T}: Add {W} or {U}. {W}{U}: Azorius Keyrune becomes a 2/2 white and blue Bird artifact creature with flying until end of turn.

Destroy target artifact or enchantment, then populate. (Create a token that's a copy of a creature token you control.)

Scavenge {0} ({0}, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only...

Haste

[+1]: Until your next turn, whenever a creature deals combat damage to Vraska the Unseen, destroy that creature. [-3]: Destroy target nonland perm...

{4}{G}{W}: Create a 3/3 green Centaur creature token. {2}{G}{W}: Populate. (Create a token that's a copy of a creature token you control.)

Exile an instant or sorcery spell you control: Put two +1/+1 counters on Nivmagus Elemental. (That spell won't resolve.)

Whenever another creature enters the battlefield under your control, you gain life equal to that creature's toughness. {1}{G}{W}, {T}: Populate. (...

Trample Cryptborn Horror enters the battlefield with X +1/+1 counters on it, where X is the total life lost by your opponents this turn.

Whenever you cast an instant or sorcery spell, Blistercoil Weird gets +1/+1 until end of turn. Untap it.

Return target card from your graveyard to your hand. Exile Treasured Find.

Draw four cards, then discard two cards.

Enchant creature Enchanted creature gets +1/+1 for each card in its controller's hand. At the beginning of the draw step of enchanted creature's ...

Target creature you control gets +1/+0 until end of turn and can't be blocked this turn. Overload {3}{U}{R} (You may cast this spell for its overl...

Rakdos's Return deals X damage to target opponent or planeswalker. That player or that planeswalker's controller discards X cards.

This spell can't be countered. Destroy all creatures.