Pallous, Mutagen Carrier

Haste
{t}: Put a host counter on another target creature.
It gains host for as long as you control Pallous,
Mutagen Carrier. (That creature has all activated abilities of creatures with host counters on them.)
At the beginning of your end step, deal X
damage to each creature with a host counter on
it, where X is the number of creatures with host
counters on them.