He's using his frost breath to turn the mice into ice (aka removing their first letter)
They take the act of millingputting cards from a library into a graveyardand turn it into something powerful, like dealing damage, drawing extra cards, or producing creatures
Going through these was tough because I was never sure whether the oddities were intentional or truly misprints
And, hey, if your opponent would rather just not attack and get poisoned, that's fine too
Whenever equipped creature deals combat damage to a player, create a 4/4 gold Dragon creature token with flying and roll a d20 (a twenty-sided die)
You take on the role of an Illumineer, able to wield magical inks and the power of Lorcana to bring famous Disney characters to life as reflections