Kavaron Harrier

The math on this attacker is stranger than its body suggests. A one-mana 2/1 that swings for four when you pour two more into it is a fine aggressive rate, but the token it makes is not a permanent gain: it enters tapped and attacking, then gets sacrificed at the end of combat, once damage has already been dealt. You are renting a second attacker for exactly one combat step, not building a board. That framing changes how the ability wants to be used. Each attack becomes a decision about whether two extra mana buys enough reach to matter that turn, and because the token is committed to the attack the moment it arrives, it can still be blocked and traded off during combat: the opponent gets a normal shot at it, they just cannot punish it afterward, because there is no afterward. What the sacrifice clause really pays for is the freedom to swing hard without leaving a board that a later sweeper can catch: the disposable Robot is gone before your next turn regardless of what happens to it. This belongs to a small family of attack triggers that manufacture temporary attackers rather than lasting ones, spending mana for tempo instead of permanence. The catch, and the payoff, is that a token which enters tapped-and-attacking and dies at end of combat still counts as a creature attacking, and as a creature dying: read as pure aggression it is a mana sink on a one-drop, but read as a repeatable trigger-generator that cleans up after itself, it is doing more specific work than the rate implies.