Thank you for the suggestions I do have a quick question about how rakdos Lord of riots works. Doesn't his damage reduction only count for damage on this turn? So shouldn't it only discount for my first and second main phase?
For instance if they get damaged on their turn I don't think I get any discount
The ability "Creature spells you cast cost {1} less to cast for each 1 life your opponents have lost this turn." does not care about damage, just life lost. So, if your opponents lose life (via damage, "lose life" effects and such) during
any turn, you will have the correspondent cost reduction (during that turn), independently of the phase you are currently.
For example, having 3 opponents, when the trigger from
Creeping Bloodsucker resolves during your upkeep, your creatures will cost 3 less mana to cast during all the phases of your turn.