Deathbringer Regent

Flying
When Deathbringer Regent enters, if you cast it from your hand and there are five or more other creatures on the battlefield, destroy all other creatures.

Dragon Fodder

Create two 1/1 red Goblin creature tokens.

Rain of Gore

If a spell or ability would cause its controller to gain life, that player loses that much life instead.

Explore

You may play an additional land this turn.
Draw a card.

Swamp

Mountain

Soul Warden

Whenever another creature enters, you gain 1 life.

Attune with Aether

Search your library for a basic land card, reveal it, put it into your hand, then shuffle. You get {E}{E} (two energy counters).

Blood Artist

Whenever Blood Artist or another creature dies, target player loses 1 life and you gain 1 life.

Goblin Gathering

Create a number of 1/1 red Goblin creature tokens equal to two plus the number of cards named Goblin Gathering in your graveyard.

Forest

Sylvan Bounty

Target player gains 8 life.
Basic landcycling {1}{G} ({1}{G}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)

Doomskar

Destroy all creatures.
Foretell {1}{W}{W} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Kor Celebrant

Whenever Kor Celebrant or another creature you control enters, you gain 1 life.

Plains

Moon-Blessed Cleric

Divine Intervention — When Moon-Blessed Cleric enters, you may search your library for an enchantment card, reveal it, then shuffle and put that card on top.