The Reaper is certainly a powerful Commander if you wrap your head around your -1/-1 strategy, but I do think Auntie Ools card draw is the more compelling feature, as you might even be able to draw The Reaper, and other synergistic cards, by exploiting your Ward/Blight abilities
On the Instant and Sorcery side of support, weve got Chaos Wand, which is a three mana Artifact
Its not uncommon to see Restoration Angel show up in white control decks that dont have a ton of creatures to blink, just as a surprise blocker or to threaten opposing planeswalkers
Alexios, Deimos of Kosmos The mono-red Alexios, Deimos of Kosmos has an ability similar to cards like Xantcha, Sleeper Agent
Jolly Roger, Hook's Ship The first location card to become a Disney Lorcana promo
Its also cheap to give Ken, Burning Brawler first strike to help it survive more combat phases