Typal decks can leverage upgraded effects in almost every important category, just by making the necessary deckbuilding commitment: ramp, draw, recursion, tutoring, removal and defensive interaction, even better color fixing
Yes, all of those Digimon are prevented from leaving
Jace broke Standard wide open in 2010 and has been pulling his weight handily across all other formats ever since
After all, anything printed before Exodus used a black expansion symbol regardless of rarity, so the symbol color won't help you tell what rarity a card is
The latter are there primarily to entertain players, and make fun of Magics history and mechanics
While it would be sweet to see mill break Standard, considering Startled Awake rotates in a couple months, it's probably wise to sell your copies now and spend the money on cards for post-rotation Standard