Mill

[Cipher89]

Infinite mana plus  {Undercity Informer} +  {Reassembling Skeleton}

[Leevai420]

If your already in an infinite mana loop why not go for something like fireball...

[Destore117]

 4 {braid of Fire}+ {Vagrant Plowbeasts} +  {Undercity Informer}
Tons of spare mana to do this as many times as you need

[Pleeb]

4 {braid of Fire}+ {Vagrant Plowbeasts} +  {Undercity Informer}
Tons of spare mana to do this as many times as you need

You can't regenerate a creature you're sacrificing.

[Destore117]

Awe... Was a decent idea...

[DylanW18]

{Undercity Informer} + {Mortus Strider} works as well