Zendikar Rising

Kazandu Mammoth | Creature | Elephant | Landfall — Whenever a land enters the battlefield under your control, Kazandu Mammoth gets +2/+2 until end of turn. | Grzegorz Rutkowski

Oran-Rief Ooze | Creature | Ooze | When Oran-Rief Ooze enters the battlefield, put a +1/+1 counter on target creature you control. Whenever Oran-Rief Ooze attacks, put a +1/+1 counter on each attacking creature with a +1/+1 counter on it. | Daarken

Scute Swarm | Creature | Insect | Landfall — Whenever a land enters the battlefield under your control, create a 1/1 green Insect creature token. If you control six or more lands, create a token that's a copy of Scute Swarm instead. | Alex Konstad

Grakmaw, Skyclave Ravager | Legendary Creature | Hydra Horror | Grakmaw, Skyclave Ravager enters the battlefield with three +1/+1 counters on it. Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on Grakmaw. When Grakmaw dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on Grakmaw. | Filip Burburan