Ahn-Crop Invader

The conditional first strike is the tell that this was built to attack and only to attack. During your turn it swings first; on the crackback it blocks as a plain 2/2, a small asymmetry that keeps a first-striking beater from doubling as a free wall. The second line is where the attacker becomes an outlet: pay one, feed it another creature, and it grows +2/+0 with no ceiling but your board. That pairing does specific work in a sacrifice deck. First strike settles combat before the blocker's damage lands, so a pumped attacker kills the creature in front of it and walks away clean, converting a blocked swing into removal plus a surviving threat rather than a trade. It rewards a go-wide board that has already served its purpose, turning spent tokens and chump-blockers into a lethal engine one sacrifice at a time. The pump itself carries no timing restriction, which is the wrinkle: you can crack a doomed creature in response to removal to bank the value on any turn, and the extra power still bites on defense, since a 2/2 that pumps to 4/2 as a blocker can trade up into a larger attacker even without first strike off your turn. What it cannot do off-turn is strike first, so the toughness stays fragile and the defensive math is a fallback, not the plan. Only the first strike is fenced to your combat, so the whole design points one direction: a common-rarity sacrifice payoff, plain in what it asks for and honest about what it gives back.