OG Megatron

Reach, Sunburst
Crew 5
OG Megatron gets +X/+0 until end of turn
where X is the total power of all creatures used
to crew it plus 1.
{x}, {t}: Put a charge counter on OG Megatron
for each color of mana spent on X.
{5}, {t}: Remove X charge counters from OG
Megatron. Exile each Legendary permanent
with converted mana cost X.