You add just two counters on your blue planeswalker, because Doubling Season specifically says you only get double counters from an effect , and adding loyalty counters to activate a loyalty ability is a cost , not an effect
Swipe up on your card to send it away and you will receive the offer card in return
You dont want them in your Miirym, Sentinel Wyrm deck that plays one large threat each turn
Set Boosters The play boosters have two more playable cards and less variance with one less wild card and potentially one less uncommon than set boosters

Creature Human Werewolf // Creature Werewolf Common Andrew Mar null/null NOT LEGAL Standard NOT LEGAL Future LEGAL Historic LEGAL Timeless LEGAL Gladiator LEGAL Pioneer LEGAL Explorer LEGAL Modern LEGAL Legacy LEGAL Pauper LEGAL Vintage NOT LEGAL Penny LEGAL Commander LEGAL Oathbreaker NOT LEGAL Standardbrawl LEGAL Brawl NOT LEGAL Alchemy LEGAL Pauper Commander LEGAL Duel NOT LEGAL Oldschool NOT LEGAL Premodern NOT LEGAL Predh Menace Daybound -------- Menace Nightbound (This creature can't be blocked except by two or more creatures.) Daybound (If a player casts no spells during their own tunr, it becomes night next turn.) -------- Fearsome Werewolf Menace (This creature can't be blocked except by two or more creatures.) Nightbound (If a player casts at least two spells during their own turn, if becomes day next turn.) Menace (This creature can't be blocked except by two or more creatures.) Daybound (If a player casts no spells during their own turn, it becomes night next turn.) Daybound (If a player casts no spells during their own turn, it becomes night next turn.) Menace (This creature can't be blocked except by two or more creatures.) Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.) Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)

The last way to play cards from your opponents deck is to copy what they are doing