The Divider

Indestructible, protection from everything,
shroud. This creature can't attack or block.
All creatures you own add "When this card enters
the battlefield, choose Left or Right and place it
accordingly in relation to The Divider, furthest
away." to their text.
{t}: Swap creatures from Left and Right.
Creatures will remain the same distance
from The Divider. Activate this ability only during
combat, after blockers have been declared.