Offensive Bias

Other sentinels you control gain haste.
Offensive bias cannot attack unless you control 3 other sentinels.
At the beginning of your upkeep, if you control 3 or less other sentinels. create a 1/1 Sentinel Aggressor creature token. If you control 4 or more other sentinels, create a 4/4 Sentinel Enforcer creature token instead.