Someone with a calculator and more time than I have can figure out when this kills, but I bet it's pretty fast.
Edit: Not sure if Sprout Swarm is faster or slower than propagator.
Edit edit: sprout swarm is infinte, so it's faster. Forgot tapping as a cost ignores haste.
Infinite isn't allowed though. =)
T3: Propagator
T4: Echos
T5: 2 Propagators
T6: 4 Props
T7: 8 Props, (26 - 12) mana could be used
T8: 16 Props, (100 - 24) mana could be used
T9: 32 Props, (392 - 48) mana could be used
...
T14: 512 Props, (393472 - 1536) mana could be used
T15: 1024 Props, (1573376 - 3072) mana could be used. Fireball.
Infinite isn't allowed though. =)
T3: Propagator
T4: Echos
T5: 2 Propagators
T6: 4 Props
T7: 8 Props, (26 - 12) mana could be used
T8: 16 Props, (100 - 24) mana could be used
T9: 32 Props, (392 - 48) mana could be used
...
T14: 512 Props, (393472 - 1536) mana could be used
T15: 1024 Props, (1573376 - 3072) mana could be used. Fireball.
Mirror-Sigil Sergeant
Followed Footsteps
and Pandemonium perhaps?
edit... don't think that gets 1,000,000 before turn 15 though
Note to self: Your mafia theories are usually wrong, so don't act on them.
(Okay, the first propagator attacks for one on the turn we play echoes)