yugioh continuous trap cards cannot be destroyed The Door of Destiny [WSUP-EN031] Secret Rare – Media Reload 5DS1-EN033 Yugioh! MINIATURIZE 1st Edition

This is a potent mill effect, and can combo with the readily available Mortus Strider or Call of the Nightwing army

it's amazing to see that people are earning money from it years later

SR Super Rare Dual Avatar Defeating Evil X SPELL Quick-Play Target 1 "Dual Avatar" monster you control and 1 card your opponent controls

Fierce Guardianship Fierce Guardianship is arguably the most effective protection spell for Commander and ranks among the best blue cards MTG has ever designed for the format

Why isnt anyone playing it at 3 is playing it wrong in the pure deck or even an engine

On top of that, it reads: At the beginning of your next main phase, add an amount of colourless mana equal to that spells mana value." Basically, not only do you get to say no to something, you also get to cast something bigger on your next turn