Barrin, Master Wizard + Myr Battlesphere + Ashnod's Altar + Gandalf the White

Barrin, Master Wizard

Myr Battlesphere

Ashnod's Altar

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 Ashnod's Altar 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 loops starts with Myr Battlesphere dropping onto the battlefield, where Gandalf the White steps in to double its entry trigger, leaving you with a massive swarm of eight Myr artifact creature tokens. You can then feed five of those Myrs to Ashnod's Altar to generate ten generic mana, easily paying the costs to keep the engine humming. With the mana and spare tokens ready, Barrin, Master Wizard uses a couple of mana and one final Myr sacrifice to bounce Myr Battlesphere right back to your hand, allowing you to cast it again and repeat the entire cycle for infinite value and resources.