mtg modern horizons 2 commander decks Magic: The Gathering 3 Deck including two Borderless Profile Legendary cards Collector Edition Commander Decks, Modern

In the incredibly rare case where there is no legal target for the first or second mode, those modes can't be chosen at random

309.2a: If a player ventures into the dungeon while they dont own a dungeon card in the command zone, they choose a dungeon card they own from outside the game and put it into the command zone

If the target creature's power is no longer less than the attacking creature's power as the ability resolves, mentor doesn't add a +1/+1 counter

And you'll choose the values for the copy's own enters-the-battlefield replacement effect

Here's the low-down on Disney Lorcana card sizes: Why does Disney Lorcana card size matter