Barrin, Master Wizard + Myr Battlesphere + Krark-Clan Ironworks + Gandalf the White

Barrin, Master Wizard

Myr Battlesphere

Krark-Clan Ironworks

Gandalf the White

How it works

1. Cast Myr Battlesphere by paying 7.
2. When Myr Battlesphere enters the battlefield, it triggers twice, creating eight 1/1 Myr artifact creature tokens.
3. Activate Krark-Clan Ironworks five times by sacrificing five Myrs, adding ten C.
4. Activate Barrin by paying 2 and sacrificing a Myr, returning Myr Battlesphere to your hand from the battlefield.
5. Repeat.

This engine relies on Gandalf the White to double the enter-the-battlefield trigger of Myr Battlesphere, flooding your board with eight Myr tokens for a mere seven mana. With that army assembled, Krark-Clan Ironworks turns those disposable Myrs into a massive reserve of colorless mana, while Barrin, Master Wizard uses a tiny fraction of that mana and a single sacrificed artifact to bounce Myr Battlesphere right back to your hand. Because Gandalf the White also gives your artifact spells flash, you can recast the Battlesphere instantly to repeat the cycle, yielding infinite mana, tokens, and enter-the-battlefield triggers.