Another very popular, though less powerful payoff are token doublers, which do what the package says
Nevertheless, cards that can repeatedly sacrifice creatures are commonly referred to as sac outlets, and they usually do this for little to no other costs
There are tons of cards with scry tacked on as a sort of bonus, but the scry function isnt synergistic or meaningful to the overall design of the card

Abrupt Decay Active Volcano Aegis Angel Ajani Vengeant Alpha Deathclaw Angel of Despair Angelic Rocket Argentum Armor Argentum Masticore Ass Whuppin' Assassin's Trophy Atomize Avalanche Riders Awaken the Honored Dead Awaken the Maelstrom Ayli, Eternal Pilgrim Bahamut, Warden of Light Bane of Progress Beast Within Behemoth of Vault 0 Binding the Old Gods Black Bolt, Inhuman King Bladegriff Prototype Blast Zone Blue Elemental Blast Bone Shredder Bounty Agent Bramblecrush Break the Spell Brink of Disaster Bronze Tablet Bumbleflower's Sharepot Capricious Efreet Captain's Hook Cavalier of Dawn Chain of Acid Chaos Confetti Chaos Defiler Cityscape Leveler Clay Golem Cloudchaser Kestrel Combustion Man Commander Sofia Daguerre Corrosion Cramped Bunker Crosis's Charm Culling Ritual Culling Scales Dark Temper Deadeye Harpooner Death Begets Life Decommission Deep-Fried Plague Myr Defiant Vanguard Desert Twister Despotic Scepter Destructor Dragon Detention Vortex Display of Dominance Drag to the Roots Druid of Purification Emerald Charm Emergency Eject Engineered Explosives Excavation Technique Extinguisher Battleship Eye of Doom Eye of Singularity Fatal Push Fate of the Sun-Cryst

Instant Color tag templates(None) Lull Prevent all combat damage that would be dealt this turn
While you control The Darkness Crystal, abilities that trigger whenever a nontoken creature an opponent control dies won't trigger because that card is exiled instead