Uncontrollable Anger
Most pump auras are gifts to your own board; the compulsion clause turns this one into a tool you can aim across the table. On your own creature the +2/+2 comes leashed: a fragile threat now has to swing into whatever the opponent held back. The sharper line is on a creature the opponent wants to keep home. Enchant an attacker-capable blocker (a vanilla body sitting back on defense, say), and the attacks-each-combat rider strips its ability to guard, marching it out of a profitable block and into your waiting answers. Note the limit: a creature with defender is never "able" to attack, so the compulsion does nothing to a true wall; you are pulling forward bodies that could attack but chose not to, not conscripting ones that physically cannot. The +2/+2 is the bait that makes the aura read as a present; the rider is what actually reshapes the next attack step. Flash is the delivery mechanism. Cast it during the opponent's beginning-of-combat step and the compulsion lands before attackers are declared, leaving no main phase for them to dispel it first; or flash it onto your own attacker after blocks to ambush a defender that committed to a fight it can no longer win. The four-mana, double-red cost on an enchantment that needs a board worth manipulating is the catch: it is a combat puzzle, not curve filler.
