For your consideration, here are my picks for the top mass pump spells in Magic you can use to convert twelve 1/1 Goblins, Soldiers or Rabbits into a victory
When Forsaken Crossroads enters the battlefield, scry 1
As if this werent enough, thanks to having partner, Rograkh decks can flexibly utilize whatever colors a player may want in their deck
Sinister Waltz is a great multi reanimation spell as well that can also help get back something to your deck for later, though I think it's a little medium in a deck where the commander himself is already doing a lot of reanimating
Sin, Spira's Punishment Rarity: Rare TYPE: Legendary Creature SUBTYPE: Leviathan Avatar CMC: 7 Mana cost: USD: $1.21 EUR: 1.09 TIX: 0.02 EDHREC RANK: 9638 (7/7) Flying Whenever Sin enters or attacks, exile a permanent card from your graveyard at random, then create a tapped token that's a copy of that card