norman osborn mtg card Proxy he connives Norman Osborn / Green Goblin

Karrthus, Who Rains Fire From The Sky

Though we also had Gold and Etherium Cell tokens, the next major token design that rose to prominence arrived in 2017s Ixalan in the form of Treasure tokens, which tap and sacrifice to add one mana of any color

As a rule, creatures you choose to sacrifice can never be saved from dying regardless of what effects or abilities they have at best you can immediately bring them back to life afterwards

If a card only costs generic mana, like Spire Golem and Frogmite, you can play them for free if you have enough cost reduction

Being a Counterspell for Creatures only is definitely restrictive, especially given the fact that removal spells can answer Creatures as well