Tarkir: Dragonstorm

Craterhoof Behemoth | Creature | Beast | Haste When this creature enters, creatures you control gain trample and get +X/+X until end of turn, where X is the number of creatures you control. | Magali Villeneuve

Betor, Kin to All | Legendary Creature | Spirit Dragon | Flying At the beginning of your end step, if creatures you control have total toughness 10 or greater, draw a card. Then if creatures you control have total toughness 20 or greater, untap each creature you control. Then if creatures you control have total toughness 40 or greater, each opponent loses half their life, rounded up. | Alexander Ostrowski

Teval, Arbiter of Virtue | Legendary Creature | Spirit Dragon | Flying, lifelink Spells you cast have delve. (Each card you exile from your graveyard while casting those spells pays for {1}.) Whenever you cast a spell, you lose life equal to its mana value. | Alexander Ostrowski

Ureni, the Song Unending | Legendary Creature | Spirit Dragon | Flying, protection from white and from black When Ureni enters, it deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is the number of lands you control. | Alexander Ostrowski