yugioh 5d's decks Yu-Gi-Oh! Legendary 5Ds Deck Collection Whenever you would take damage from a card effect Yugioh 5DS Double Deck Box

A common theme for Darkness Type Cards is they they can dish out Passive damage with Poison and the ability to increase damage when certain conditions are met

Demonic Tutor is an interesting one because on the surface it seems too powerful for the format, but without the banned cards mentioned above to go get, Demonic Tutor is simply a good way to ensure consistency in Duel Commander, not an overpowered enabler

They're nice pulls, but they're not the big chase cards in most modern sets

You can simply slot one copy of it in a regular Zard/Pidgeot build and now you have access to a finisher pokemon that has no damage cap