Aven Reedstalker

Flash is what justifies the four mana here. A 2/3 flyer for that cost is filler on its own terms; a 2/3 flyer that can be held up during an opponent's turn and dropped at the end step is a different proposition entirely. The card buys you the option to leave mana open for a counterspell or a trick, then commit to a body if nothing better materializes, all without telegraphing what you have. That flexibility plays cleaner in the air, where flash lets it ambush an attacker and trade up, blanking a creature that thought it was getting through for free. The Bird Warrior typing is mostly cosmetic; the structural point is that flash turns a passive blocker into a reactive one, collapsing the gap between holding interaction and developing your board. This is the workhorse end of a long line of evasive flash creatures stretching back to early ambush blockers, the kind of common-rarity card that asks nothing of your deck except a little mana discipline and rewards it with information your opponent does not get.