Ravnica Allegiance

Biogenic Ooze | Creature | Ooze | When Biogenic Ooze enters the battlefield, create a 2/2 green Ooze creature token. At the beginning of your end step, put a +1/+1 counter on each Ooze you control. {1}{G}{G}{G}: Create a 2/2 green Ooze creature token. | Lake Hurwitz

Mammoth Spider | Creature | Spider | Reach (This creature can block creatures with flying.) | Jehan Choo

Rampaging Rendhorn | Creature | Beast | Riot (This creature enters the battlefield with your choice of a +1/+1 counter or haste.) | Ben Wootten

Trollbred Guardian | Creature | Troll Frog Warrior | {2}{G}: Adapt 2. (If this creature has no +1/+1 counters on it, put two +1/+1 counters on it.) Each creature you control with a +1/+1 counter on it has trample. | Mathias Kollros

Galloping Lizrog | Creature | Frog Lizard | Trample When Galloping Lizrog enters the battlefield, you may remove any number of +1/+1 counters from among creatures you control. If you do, put twice that many +1/+1 counters on Galloping Lizrog. | Lius Lasahido

Bolrac-Clan Crusher | Creature | Ogre Warrior | {T}, Remove a +1/+1 counter from a creature you control: Bolrac-Clan Crusher deals 2 damage to any target. | Craig J Spearing

Nikya of the Old Ways | Legendary Creature | Centaur Druid | You can't cast noncreature spells. Whenever you tap a land for mana, add one mana of any type that land produced. | Ryan Pancoast