mtg roon of the hidden realm commander deck abuses etbs and a not so known rule to permanently remove enemy commanders from the game. Comment “deck” and I'll send you a link or just visit From the Commander 2013 set. Roon of the Hidden Realm

It doesn't matter whether the permanent with that ability was on the battlefield when the first card was drawn

This drop was also accompanied by an Arcane: Lands Secret Lair, with each land depicting either Zaun or Piltover, the two cities where the show takes place

The other is a quirky, synergistic puzzle box filled with unique new cards

You can choose a mode even if some or all players will be entirely or partially unaffected

At 3 mana, its a little expensive to be used as a follow-up to your back-and-forth counterspell war on the stack, but it's a fine way to remove the 100,000,000 instances of Goblin Bombardments effect