Loporrit Scout + Sinking Feeling + Phyrexian Altar + Splinter Twin

Loporrit Scout

Sinking Feeling

Phyrexian Altar

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. Acitvate Loporrit Scout by paying 1 and putting a -1/-1 counter on it, untapping it.
4. Activate Phyrexian Altar by sacrificing the creature token, adding 1.
5. Repeat.

This clever loop turns Loporrit Scout into a self-sustaining copy engine by pairing it with Splinter Twin to continuously generate fresh creature tokens. Because Loporrit Scout is enchanted by Sinking Feeling, you bypass the normal untap restrictions by paying mana and placing a -1/-1 counter on the creature to ready it for another activation. Finally, sacrificing those generated tokens to Phyrexian Altar provides the exact mana needed to fuel the Sinking Feeling untap ability, creating a closed ecosystem that yields infinite sacrifice and entrance triggers.