For that, youll be able to discard any number of creature cards as it enters the battlefield, gaining a number of keyword counters - including flying, trample, haste, indestructible, deathtouch and more - if it discards cards with those keywords
There are detailed instructions for these steps in the quick start rules book that you get with a starter deck
Combine Mad Hatter with some healing cards, and youll be building lore, hand advantage, and weaking your opponents forces all at the same time.
They could do almost anything: they might deal damage to Pokmon on the enemy bench, deal extra damage if you win a coin flip, force you to discard Energy from the Pokmon that made the attack anything
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