Windshaper Planetar

Redirecting attackers is an ancient effect, but it almost always lived on the defending side: a combat trick that scrambled the math before damage, something reactive keyed to who was swinging where. This one keys the reselection to a window most creatures never get to touch. Flash grants access to the declare-attackers step, and a permanent that enters at instant speed usually can't influence how attacks were assigned unless its trigger specifically cares about that step. Here it does: hold up mana, wait until attackers have been declared and locked in, then flash this in and point every one of those creatures somewhere new before blocks are even considered. The obvious use is multiplayer politics, spinning a swing meant for you onto a neighbor, but the sharper play is offensive: let a table commit to attacking each other, then reassign those attackers onto a defenseless player or an open planeswalker. The one restriction is that you cannot bounce an attacker back at the player who controls it, so an opponent's own creatures can never be turned against them; every reselection has to find a different target. The 4/4 flying body means the card still does something on the turns there is nothing to reroute. The effect is narrow by construction, and it ignores most of what happens in combat, but the timing it exploits (attackers assigned, blockers not yet declared) is one almost nothing else in the game gets to interact with.