Plenty of cards convert energy into card advantage, whether that's actually drawing cards or removing opposing permanents
Its still limited to one creature, though
While it wouldn't work as written, MTG Pocket could be fun if given some more restrictions - like only being able to use cards of common rarity, or from the most recent MTG sets.
(9/1/2023) Hexproof and shroud won't prevent a Role from becoming attached to a permanent if the ability creating that Role attached to that permanent doesn't target it
Thirty-nine winners of a Pokemon Card Game Illustration Contest comic contest held in Japan in 1998 received the card
The best way to support Gadrak is to draft cards like Short Sword, Silent Dart, and Witch's Cauldron, so you can quickly activate its attack ability