mtg ravnica allegiance booster box & Packs - Please Note 2019 Magic: The Gathering Ravnica

Cambridge, Massachusetts: Harvard University Press

Yes, you can counter a triggered ability with specific cards that say counter target triggered ability. Regular counterspells like Counterspell only work on spells, not abilities already on the stack

Like most Pokmon cards, the value of Pokmon Center Lady depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Champion's Path)

In the current state of the game, mill decks, stun decks, stall decks, and regular decks are all viable options

You may still have to package the cards, but thats often as far as it goes