Kalgruth, chaos ensuer

Trample

When Kalgruth, chaos ensuer enters the battlefield,
drink a beer.

Drink a beer—{1}{r/w}: roll a d20. If the result is major or equal than 16, target opponent's creature becomes a high elf in addition to its other types until the end of turn. You may activate this ability only once each turn.

When there is a high elf on the field, transform Kalgruth, chaos ensuer.