Phantasmal Form

The operative clause is the base power and toughness rewrite, and the design trick is that it works in both directions. Setting a creature to base 3/3 collapses a giant into something a modest blocker can trade with, but it does not erase +1/+1 counters or lord effects layered on top: those still apply after the base is set, so a heavily buffed attacker can actually come out larger than it went in. That makes the reliable use offensive rather than defensive. Point it at your own board and you turn two small creatures into 3/3 fliers for a combat step, an evasive tempo swing that also cantrips. Against an opponent's threat the effect is real but conditional: it is best against a big creature whose size comes from its printed body rather than from counters, and it does nothing about hexproof or a protection clause, since it has to target. The two-target clause bends it toward setting up your own alpha strike or ambushing a pair of blockers, not toward answering a single haymaker. The card draw is what earns the maindeck slot: if the board never presents a good target, you still spend three mana at instant speed and replace the card, so the spell is rarely a dead draw. That replacement floor is the difference between a narrow combat trick and a blue tempo staple that keeps a hand stocked while it manipulates the battlefield.