Barbarians
Ideally, you'll be able to kill the Infect creature while your opponent is tapped out, but if your opponent plays carefully and leaves up mana, it's still often better to cast removal during your turn, since if the Infect player does have a Blossoming Defense or Vines of Vastwood, at least they won't be able to get in extra infect damage by using it to pump their threat
Most often if you're ahead in the game you'll head left in the Dungeon and be aggressive, while going right helps you cast better spells thanks to the Treasure token and can shut down an attacker for a turn
9 Fiery Temper Burning Madness Fiery Temper is a card that, outside of desperation, you'll never actually pay its normal casting cost
This is it: the reason why Miraidon ex is so good
For how useful it is, Magic has only reprinted it twice so far contributing to the card's hefty price tag