If some, but not all of those targets become illegal, you'll do as much as possible, including creating Blood tokens
If you somehow can't discard a card (probably because you had no cards in hand and another effect prevented you from drawing cards), you won't put any counters on Cait no matter whether or not the defending player discarded a card or what that card's mana value is
Mega Tokyo is bigger, has more exclusives, includes the Pokmon Card Station and Pokmon GO Lab, and feels more immersive
Haste The Balrog, Durin's Bane can't be blocked except by legendary creatures
An exception is made for individual booster packs, which are limited to five per customer
Any planeswalker cards that are printed through Universes Beyond will be purely for the sake of gameplay