Dross Scorpion + Elemental Mastery + Phyrexian Altar + Biotransference

Dross Scorpion

Elemental Mastery

Phyrexian Altar

Biotransference

How it works

1. Activate the creature with Elemental Mastery attached by tapping it, creating a number of 1/1 Elemental creature tokens with haste equal to its power.
2. Activate Phyrexian Altar by sacrificing an Elemental.
3. When the Elemental dies as an artifact due to Biotransference, Dross Scorpion triggers, untapping the creature with Elemental Mastery attached.
4. Repeat.

This clever loop turns raw creature power into an endless engine by transforming your entire army into artifacts via Biotransference, meaning every creature that hits the graveyard simultaneously triggers Dross Scorpion to untap your creature enabler. You tap the creature enchanted by Elemental Mastery to flood the board with hasty tokens, which you immediately feed to Phyrexian Altar to generate an endless supply of colored mana. Because Biotransference makes all your creatures artifacts, their sacrifice triggers the Scorpion to refresh your tapped creature, letting you repeat the whole spectacle infinitely.