An artifact like Click to show cards Click to show cards Click to show cards Click to show cards Click to show cards If you have one or two threats in one color and a handful of removal spells in another color, that's a pretty clear signal that those should be your deck's two colors
Exploiting ways to put things on the bottom of your library will often make Grenzo, Dungeon Warden into an insane value/combo engine
The correct magic the gathering card measurements ensure cards fit sleeves, boxes, and Magic binders used by collectors
The fact that these cards are powerful but only give up one prize card can really help in battles and can mess up your opponents' prize trade
Incorporate notable blue instant spells that give you more value when cast again with rebound like Mystical Tutor, Pongify, and Cackling Counterpart
The only players who could use Slifer and the other Gods were Yugi, Seto Kaiba, and Marik Ishtar