Typically, they need multiple cards together to function
Dragapult ex BASIC STRATEGY Evolve Dreepy up into Drakloak to take advantage of its Recon Directive Ability which lets you look at the top two cards of your deck, put one of those cards into your hand, and put the other on the bottom of your deckor, use Rare Candy to evolve a Dreepy into a Dragapult ex and use its Phantom Dive attack, which does 200 damage and lets you put six damage counters on your opponents Benched Pokmon in any way you like
PS Platinum Secret Rare QCSE Quarter Century Secret Rare The Claw of Hermos X SPELL (This card is also always treated as "Legendary Dragon Hermos".) Send 1 monster from your hand or field to the GY, of the Type that is listed on a Fusion Monster that can only be Special Summoned with "The Claw of Hermos" (if that card is Set, reveal it), then Special Summon that Fusion Monster from your Extra Deck
The Pokmon TCG: VMAX Dragons Premium Collection includes
this card gains 500 ATK for each card sent to the Graveyard this way, until the End Phase
In cEDH, that usually means youll draw a lot of cards because players cant afford to hold back