Hydra of Moutain Top

Block (The first damage dealt to this creature is negated.)
Regenerate (For every health that is taken away this creature gains a +2/+0 counter.)
If Hydra of Mountain Top has 10 +2/+0 counters, Hydra of Mountain Top gains Trample and Doublestrike. You loose 2 health every time it's your upkeep.