Activated when a monster attacks the duelist, it takes all of that attack's force and sends it right back at them to destroy every card on the opponent's side of the field in attack position
Bear in mind that those arent exact numbers, as the number of monster, spell and trap cards in your deck will ultimately come down to what youre trying to achieve during a duel - you may have more or less of each type of card
You get to use its activated ability three times in a game over the course of several turns
Witherbloom's Professor Dellian Fel is certainly a card we're already seeing used in Standard, and it has some big potential within Commander too
Reckless Bushwhacker Convoke Game-Ender Reckless Bushwhacker was at one point a meta-relevant card in the Modern and Pioneer formats, acting as a game-ender by casting it with its surge cost to give all your creatures haste to swing and win with one attack
Control and stun decks not only lock your opponent down but essentially prevents them from playing the game while you achieve your win condition