Ragnaros and Rakdos

Flying Mountainwalk
This creature cant be countered
When this attacks or ETBs you become the
monarch.If you are the monarch: At the end
of your turn deal 8 damage to each opponent,
then 8 damage to 3 target creatures, then you
may exile a card from your hand. While that
card is exiled, you may cast that card using
mana of any color, and its casting cost is
reduced by 8 mana.