Leonin Snarecaster

Two mana buys a 2/1 and a single tap on the way in, and that tap is doing almost all of the work. This is a tempo card wearing a body: the enters-the-battlefield trigger clears one would-be blocker on the swing-in turn, pushes the Cat through alongside the rest of your attackers, and then leaves you with a fragile creature the opponent is happy to trade with the moment it stops threatening damage. The trigger is one-shot and stapled to entering, so this is not a repeatable tapper like Master Decoy; it buys exactly one combat step, and the entire value proposition is winning a single race rather than assembling a lock. The "you may" clause is housekeeping rather than a hidden line: the tap can target any creature regardless of whose it is, so the optional wording exists only to spare you from a mandatory, self-defeating trigger when the opponent controls nothing worth tapping. Without that out, an empty board across the table would force you to tap your own attacker or the Snarecaster itself. It descends from a long line of cheap white creatures whose entrance ability functions as removal you get to use precisely once, priced modestly into a body that has served its purpose the moment its attack resolves.