COMBO

1. Play Dragon Soul/Red Mana Wyrm (note that this will delay your combo by a turn)
2. Play Spirit of the Dead
3. Play Test Subject
4. Play (in order) Regenerate, Embalming Ritual and Topsy Turvy to summon 5/5 Dragons and trigger Spirit of the Dead
5. Repeat steps 2 to 4 every turn until your run out of Test Subjects