Kove, Losthowl Alpha

When Kove, Losthowl Alpha enters the battlefield and whenever a Wolf creature you control deals combat damage to a player, create
two 2/2 green Wolf creature tokens.
Cumulative upkeep - Sacrifice a Wolf (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)