We saw the MDFCs progress through Kaldheim and Strixhaven, getting more card types available for the front and back
Thunderclap Drake's second ability can't reduce the amount of colored mana you pay for a spell
Purging Stormbrood Purging Stormbrood comes in swinging as a 4/4 flier, but it also strips counters off a creature when it enters
I stipulated blue in the title, this was merely so I didn't have to work out where Mana Tithe fits into the mix and spend a lot of convoluted time discussing the implications of a functional reprint in a different colour
For a permanent spell to trigger Riku, it would need to have you choose modes upon casting the spell, not a modal ability tied to a trigger that belongs to the permanent on the battlefield
It has a x2 weakness to darkness type Pokemon, a -20 resistance to fighting type Pokemon, and a two colorless energy card retreat cost