So let me get this straight.
Roach Lethal Math Formula:
(Number of cards played x number of Roaches going face) + (Base Damage + Cairn buffs + Cards played after my first Roach) = Total Damage
Most lethal turns involve 2 Roaches going face so we can assume that our base damage = 3. Let's pretend evolve points don't exist for simplicity's sake.
Example 1:
I have two 0pp spells, 2 fairies, 1 Roach, and one 1pp bounce. I play my spells and fairies, play my Roach, hit face, bounce Roach, and play Roach again.
(4 x 2) + (3 + 0 + 1) = 10 total
Example 2:
I have one 0pp spell, two 3pp Bayles, two fairies, one Cairn on board, one Godwood on board, one Roach, and a few enemies on board. I play my 0pp spell, then trade my fairies, play Roach, buff Roach with Cairn, hit face, bounce Roach with Godwood, play my 0pp Bayles, and play Roach.
(3 x 2) + (3 + 1 + 2) = 12 total
Is my math right?