Eldruss, Guren's prodigy

clockwork mana (each {p/c} on this card costs 1
mana of its color. reduce 1 {p/c} in each instance on
this card, including its cost, from 1 mana of its
color to {0} for each other permanent with
clockwork mana).
hexproof
this creature enters the battlefield with x +1/+1
counters on it where x is 5 minus the amount of
mana spent to cast this card.