Loporrit Scout + Sinking Feeling + Earthcraft + Splinter Twin

Loporrit Scout

Sinking Feeling

Earthcraft

Splinter Twin

How it works

1. Activate Loporrit Scout by tapping it, creating a creature token.
2. When the creature token enters the battlefield, Loporrit Scout triggers, giving Loporrit Scout +1/+1 until end of turn.
3. Activate a basic land by tapping it, adding 1.
4. Activate Earthcraft by tapping the creature token, untapping the basic land.
5. Acitvate Loporrit Scout by paying 1 and putting a -1/-1 counter on it, untapping it.
6. Repeat.

By enchanting Loporrit Scout with Splinter Twin, you gain the ability to tap it to create a hasty token copy of itself, which triggers Loporrit Scout's passive prowess-like growth. To fuel this engine indefinitely, Sinking Feeling grants Loporrit Scout an active untap ability requiring {1} and a -1/-1 counter, while Earthcraft allows you to offset that cost by tapping your newly minted tokens to untap a basic land for mana. This loop effortlessly spins out an infinite number of creature enters-the-battlefield triggers alongside an endless army of tapped creature tokens!