Wardscale Dragon

The static ability does its work only while this creature is attacking, and that window is the entire pitch: once attackers are committed, the defending player cannot cast spells at all. No flash blocker declared in the declare-blockers step, no combat trick to save a chump, no removal aimed mid-swing. Combat normally hands the defender a full instant-speed window after attackers turn sideways; this slams that window shut. The 4/4 flying body is unremarkable for six mana, so the lockout is what you are buying, and what it competes against is not other Dragons at the top of the curve but the toolkit that usually clears the runway before an attack: tap-down effects, edicts, a discard spell to strip the trick first. The defender can still act freely before attackers are declared, including in the beginning-of-combat step, so this is a scalpel rather than a stax piece; it removes one specific window, not the turn. The shape of the card is also its cost: the lock exists only during the attack, so it contributes nothing on defense and vanishes the instant you stop swinging. It is a creature built to make exactly one combat phase safe, and within that narrow charter it works without ambiguity.