Mana costs of melded creatures

George Posts: 49 Just Dropped In
Melded creatures should have assigned mana costs of at least the lesser one of the two creatures.

Although it turned out to be very fortunate for me, I shouldn't be able to exale Brisela with Baffling End. Both of the creatures cost minimum 12, but the melded Brisela only 1.

Could I take it over with Claim the Firstborn?