
Autarch Mammoth | Creature | Elephant Mount | When this creature enters and whenever it attacks while saddled, create a 3/3 green Elephant creature token.
Saddle 5 (Tap any number of other creatures you control with total power 5 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.) | Leonardo Santanna

Migrating Ketradon | Creature | Dinosaur | Reach
When this creature enters, you gain 4 life.
Cycling {2} ({2}, Discard this card: Draw a card.) | Izzy

Aatchik, Emerald Radian | Legendary Creature | Insect Druid | When Aatchik enters, create a 1/1 green Insect creature token for each artifact and/or creature card in your graveyard.
Whenever another Insect you control dies, put a +1/+1 counter on Aatchik. Each opponent loses 1 life. | Loïc Canavaggia

Pyrewood Gearhulk | Artifact Creature | Construct | Vigilance, menace
When this creature enters, other creatures you control get +2/+2 and gain vigilance and menace until end of turn. Damage can't be prevented this turn. | Martin de Diego Sádaba

Samut, the Driving Force | Legendary Creature | Human Warrior Cleric | First strike, vigilance, haste
Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.)
Other creatures you control get +X/+0, where X is your speed.
Noncreature spells you cast cost {X} less to cast, where X is your speed. | Chris Rallis