Arashin War Beast | Creature | Beast | Whenever Arashin War Beast deals combat damage to one or more blocking creatures, manifest the top card of your library. (Put it onto the battlefield face down as a 2/2 creature. Turn it face up any time for its mana cost if it's a creature card.) | Eric Deschamps
Sandsteppe Mastodon | Creature | Elephant | Reach
When Sandsteppe Mastodon enters the battlefield, bolster 5. (Choose a creature with the least toughness among creatures you control and put five +1/+1 counters on it.) | James Zapata
Atarka, World Render | Legendary Creature | Dragon | Flying, trample
Whenever a Dragon you control attacks, it gains double strike until end of turn. | Karl Kopinski