This is in addition to the random assortment of cards youll gain from opening booster packs, either from codes or as ladder and battle pass rewards
Time Walk is the next one
Hydra commanders may consider it as a 3-drop, and some +1/+1 counters decks use it to buff nontoken creatures as they enter
I counted all the differences: take the 38,768 unique cards, account for 58,779 in additional foils and treatments, plus 718,172 non-English cards, 5,278 non-playables (the tokens, art cards, etc.), 755 playtest cards, Arena's 221,930 cards in their languages, and 29,252 MTGO cards and you arrive at our total of 1,072,934
For example, a weak card with awesomeness might increase the mechanic's as-fan in a Play Booster, but that doesn't necessarily increase the as-play for the mechanic