Fang Guardian

Green almost never gets to hold up interaction, which is exactly what makes the flash here the whole design and not a bolted-on keyword. Drop this at instant speed during your opponent's declare-attackers step and you have manufactured a surprise blocker whose enters trigger hands another creature or Vehicle you control +2/+2 until end of turn: the ambusher trades or eats an attacker while the pump wins a fight the opponent thought was theirs, a clean two-for-one out of a combat step you were supposed to lose. The 4/2 body is deliberately thin because the payoff sits on the trigger, not on the creature living: two toughness is the price of a four-mana flash creature that can blow open a race. The buff being temporary matters for how you sequence it, though; the +2/+2 evaporates at end of turn, so flashing this in during your opponent's turn buys you the ambush block but leaves nothing behind for your own attack. Save it for your combat when you want the pump to swing. Including Vehicles among the legal targets is the quiet tell about the intended shell: a flashed-in +2/+2 can shove a crewed attacker past a blocker or turn a middling Vehicle lethal a turn ahead of schedule. It belongs to green's family of flash beaters that reward keeping mana open, with one wrinkle: the value lands on a permanent already in play rather than on the creature itself, which is precisely why the body can afford to be so fragile.