With just Gravemother and an encored Legion, you have four slivers in play, which means each gets +9/+9
Illustrated by: Loc Canavaggia Not Legal Traditional Standard Not Legal Traditional Alchemy Not Legal Traditional Historic Not Legal Traditional Timeless Rulings 2014-07-18 Constricting Sliver gives Slivers you control an ability that causes a zone change with a duration, a newer style of ability thats somewhat reminiscent of older cards like Oblivion Ring
These require you to throw the cards around, with Chaos Orb being the most famous
You get to use your card on your turn before they get to use theirs, which is better for you than them, but more importantly, everyone else gets to take their turns before the player youve given two cards to gets to take theirs, which means those two cards theyve drawn might contribute to them helping you by stopping another one of your opponents from winning before it gets back to them
If Delina is your red commander, its easier to build around it since having this copy ability in the command zone is very strong
It was the last piece of power I needed, it would go in ever Oldschool deck I had, if I ever wanted to finish a set of unlimited I would need it, and if I ever decided to try out Vintage I would want it