Brotherhood Outcast + Shade's Form + Bloodthrone Vampire
Brotherhood Outcast
Shade's Form
Bloodthrone Vampire
Infinite creature ETBInfinite creature LTBInfinite creature sacrifice triggersInfinite death triggersInfinitely large creature until end of turn
How it works
Activate Bloodthrone Vampire by sacrificing Brotherhood Outcast.
When Brotherhood Outcast dies, Shade's Form triggers, returning Brotherhood Outcast from your graveyard to the battlefield.
When Brotherhood Outcast enters the battlefield, it triggers, returning Shade's Form from your graveyard to the battlefield attached to Brotherhood Outcast.