Thunderbreak Regent

Flying Whenever a Dragon you control becomes the target of a spell or ability an opponent controls, Thunderbreak Regent deals 3 damage to that player.

City of Traitors

If you play any land, sacrifice City of Traitors. {T}: Add two colorless mana to your mana pool.

Magus of the Moon

Nonbasic lands are Mountains.

Shattering Spree

Replicate {R} (When you play this spell, copy it for each time you paid its replicate cost. You may choose new targets for the copies.) Destroy target artifact.

Sarkhan, the Dragonspeaker

+1: Until end of turn, Sarkhan, the Dragonspeaker becomes a legendary 4/4 red Dragon creature with flying, indestructible, and haste. (He doesn't lose loyalty while he's not a planeswalker.) -3: Sarkhan, the Dragonspeaker deals 4 damage to target creature. -6: You get an emblem with "At the beginning of your draw step, draw two additional cards" and "At the beginning of your end step, discard your hand."

Chandra, Pyromaster

+1: Chandra, Pyromaster deals 1 damage to target player and 1 damage to up to one target creature that player controls. That creature can't block this turn. 0: Exile the top card of your library. You may play it this turn. -7: Exile the top ten cards of your library. Choose an instant or sorcery card exiled this way and copy it three times. You may cast the copies without paying their mana costs.

Goblin Rabblemaster

Other Goblin creatures you control attack each turn if able. At the beginning of combat on your turn, put a 1/1 red Goblin creature token with haste onto the battlefield. Whenever Goblin Rabblemaster attacks, it gets +1/+0 until end of turn for each other attacking Goblin.

Pia and Kiran Nalaar

When Pia and Kiran Nalaar enters the battlefield, put two 1/1 colorless Thopter artifact creature tokens with flying onto the battlefield. {2}{R}, Sacrifice an artifact: Pia and Kiran Nalaar deals 2 damage to target creature or player.

Chalice of the Void

Chalice of the Void enters the battlefield with X charge counters on it. Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void, counter that spell.

Simian Spirit Guide

Remove Simian Spirit Guide in your hand from the game: Add {R} to your mana pool.

Chrome Mox

Imprint — When Chrome Mox enters the battlefield, you may exile a nonartifact, nonland card from your hand. {T}: Add one mana of any of the exiled card's colors to your mana pool.

Blood Moon

All non-basic lands are now basic mountains.

Magma Jet

Magma Jet deals 2 damage to target creature or player. Scry 2. (Look at the top two cards of your library, then put any number of them on the bottom of your library and the rest on top in any order.)

Stormbreath Dragon

Flying, haste, protection from white {5}{R}{R}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When Stormbreath Dragon becomes monstrous, it deals damage to each opponent equal to the number of cards in that player's hand.

Koth of the Hammer

+1: Untap target Mountain. It becomes a 4/4 red Elemental creature until end of turn. It's still a land. -2: Add {R} to your mana pool for each Mountain you control. -5: You get an emblem with "Mountains you control have '{T}: This land deals 1 damage to target creature or player.'"

Ancient Tomb