Given how many cards there are that either want to die, or that make sacrificial Thopters or Servos, this cost isnt really a drawback at all, and being able to cheat in one of the big old Creatures from earlier in the list, or even something like Darksteel Forge, which gives all of your Artifacts indestructible, losing three of anything is always worth it
Zenith Festival & Commune with Lava Zenith Festival and Commune with Lava generate a massive burst of cards
"What is an Acorn Card in MTG's Unfinity?"
Whenever you cast a spell, each opponent reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard
While this might not seem like a financial benefit, in a weird way it is, since you sort of get multiple decks for one price
For example, Invasion of Gobakhan is a Battle that, when defeated, transforms into Lightshield Array, a powerful Enchantment that pumps your team and can be sacrificed to give them hexproof and indestructible until end of turn