Once per turn: You can reveal the top card of your Deck, and if it is a Normal Spell Card, send it to the Graveyard, otherwise place it on the bottom of your Deck. During the Main Phase of your next turn, you can activate the effect of that Spell Card in your Graveyard (even if you no longer control this face-up card).
All 3 of these can be used using Diamond Dude's effect without having to use the needed cost. These cards are quite strong since they can clear your opponent's entire field, or even the entire board if you are using final destiny, essentially resetting everything. This can give you a huge advantage since you can do a direct attack right away.
Removing the cost, you can use Diamond Dude's effect to summon monsters like Water Dragon, or Gearfried the Swordmaster without having to bring the pre requisite monsters. This can help with being able to summon monsters like Water Dragon much easier, or Gearfried faster. It works best when you use ways to know what the top card of your deck is, through skills like Aroma Strategy, or other card effects.
|Actions||Pick up a card / Changes Deck order / Sends from your Deck to your Graveyard / Activates cards from your Graveyard|