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You should also pay attention to highlighting the text effect

This fan-favorite mechanic allows you to tap your creatures in order to help pay for a spell's casting cost

DFCs were the highest-ranked mechanic in the set, one of the highest rankings of anything we'd ever seen

If you want to , harmonize also allows you to tap one of your creatures to reduce said alternative cost ( strictly better than flashback!) As a drawback, you have to exile the harmonize spell as soon as it exits the stack (exactly like flashback)

Note that the restrictions wear off the moment Ravenous Tarantula becomes Pain Gainer, so this is a very feasible strategy

The final spoiler for the day is from Wizards of the Coast employee Sam Stoddard