At the beginning of the first upkeep in your next game with that player, you draw two cards
doesnt produce any effect
(It counts as flipping a coin, not rolling a die.) Each time a spell or ability instructs you to flip a coin, you may apply Pokey's second ability as a replacement effect to roll a d20 instead
For example, Obosh, the Prey Piercer can only be used as the companion of decks that exclusively feature spells with odd-numbered mana costs, and Yorion, Sky Nomad can only be used as the companion for decks featuring 20 more cards than the minimum for their format
If youre taking a common sense approach for what counts and doesnt count as a unique MTG card - namely, that if you look at two cards side by side is there a clear and intended difference between them and way to tell them apart - then clearly foil card variants count as unique, different cards