Maybe a card idea gets filed and sticks forever, maybe it gets tweaked in playtesting, or maybe it gets cut completely. In the final Play Design Stage, a separate Wizards of the Coast team with a background in competitive Magic vets the nearly complete set for its competitive elements, sending back proposed changes to fix any balance issues
Ivysaur doesn't have an Ability but it does have two moves, the first move is called Sleep Powder and for two energy cards, one each of grass and colorless, it does 20 damage and puts the defending Pokemon to sleep
MTG Doctor Who decks The MTG Doctor Who crossover consists of a mixture of reprints with a Doctor Who theme and brand new Doctor Who cards
Oh, and for good measure, theres an Elementals-themed equivalent to the best effects in sea creatures decks
You need permanents for it to attack/block, like lands
Quick answer: both