Prismari Apprentice

Magecraft's evasion payoff, and the one built around doubling rather than chaining. Every cast or copy of an instant or sorcery makes this 2/2 unblockable for the turn, which is the design tell: a shell leaning on copy effects gets each doubled spell counted twice, so the body slips through unopposed while a big enough spell hangs a counter on it. Most creatures with this keyword convert spell volume into tokens, prowess, or drain; this one turns the same activity into damage that never has to fight through a board. The unblockable flag lasts the full turn, so a two-drop you can commit early becomes a reliable delivery vector: whether the attacker connects is rarely the hard question, whether your instant resolves is. Growth is gated hard behind mana value: only a spell of five or greater earns the +1/+1 counter, which keeps the creature from ballooning off the cheap cantrips that make up most of a spellslinger deck's volume. So the two halves pull opposite ways, and that opposition is the whole idea. Cheap spells keep it swinging in; expensive spells make each swing hurt more. It rewards a deck already doing what it wants: cast, copy, connect, and let the sequencing turn a fragile body into something that closes.