Forcing a creature can be advantageous. It can either just remove a blocker from your next combat or it can force a creature to enter combat against a much stronger opponent and therefore remove that creature entirely. I'm not so sure it should cost 3 though. The cantrip is nice and definitely adds 1 to the mana cost, but I still don't know if paying 2 to make something swing is worth it. Bloodshed Fever is an enchantment that does it for 1 and Into the Fray is an instant that also does it for 1 mana (and both are somewhat repeatable). The trip saves this from the ranks of horrendous Magic cards. It just doesn't do enough to let this sit at the mediocre cards' table.
Pros: Forces an attack, cantrip
Cons: Costs 3