If you need any boosters, commander decks or Avatar The Last Air Bender sealed product, you can find them here at Gathering Games
That means you gain at least two permanents when it attacks, but you can bolster that greatly by simply adding in other sacrificial effects to your deck
Enter Imaginary Threats, which is awesome in multiplayer
This time it gives your Commander evasion in the form of menace and then gets a power boost equal to their graveyard creature count, so it's a win con in the Command Zone as both of those work very nicely together
Creature (44) 2x Bonescythe Sliver 2x Crystalline Sliver 4x Dormant Sliver 2x Galerider Sliver 4x Gemhide Sliver 2x Harmonic Sliver 4x Heart Sliver 4x Manaweft Sliver 4x Necrotic Sliver 2x Sentinel Sliver 4x Sidewinder Sliver 4x Sinew Sliver 2x Sliver Hivelord 2x Sliver Legion 2x Ward Sliver Land (16) 2x Forest 1x Island 2x Jungle Shrine 1x Mountain 1x Plains 2x Savage Lands 2x Seaside Citadel 4x Sliver Hive 1x Swamp Sliver Deck, main target is to draw cards, mainly silver non-stop bring them into play while they already have flash and draw and play even more sliver crads
Have fun creating value by copying your Adventure spells, buying back your creatures, and drawing a bunch of cards