Flame Strider

Flame Strider can't be blocked.
Pay X life: Each other creature you control with
a toughness less than or equal to X phases out.
At the beginning each opponent's next
main phase, that player may have Flame Strider
deal X damage to them to add an amount of red
mana to his mana pool equal to or less than X.
"Talent is a flame. Genius is a fire."
- Bernard Williams