mtg cards that reduce activated ability cost Zirda, the Dawnwaker (foil) Companion — Each permanent card in your starting deck has an activated ability Zirda, the Dawnwaker (Multiverse Legends)

It requires a touch of political finesse to assure it comes back your way a great bargain would be trading it to the player whos falling behind but it adds interest to the board state and often sparks interesting deals that you wouldn't get otherwise

There are no Red cards that offer this effect, though there are certainly plenty that care about Creature types

That said, there is more to building a commander deck than this and there are 4 functions that every commander deck should include

Giada, Font of Hope For years, building an Angel deck felt cool in theory, but way too slow

When you exile a nonland card this way, Hidetsugu deals damage equal to the exiled cards mana value to any target