Oath of the Gatewatch

Harvester Troll | Creature | Troll | When Harvester Troll enters the battlefield, you may sacrifice a creature or land. If you do, put two +1/+1 counters on Harvester Troll. | Greg Staples

Seed Guardian | Creature | Elemental | Reach When Seed Guardian dies, create an X/X green Elemental creature token, where X is the number of creature cards in your graveyard. | Vincent Proce