Some of the cards that are good for your deck, like Sanctum Gargoyle, Executioners Capsule, and the Spellbombs, are good in other decks, so the most likely way to end up in Affinity is to just backdoor into it after picking up a few of these and noticing quality artifacts going late
But be aware, you are taking a gamble as you cant fully verify the condition of the card
WHERE THE MAGIC IS HAPPENING DOCUMENTATION Comprehensive guides for setup, usage, and advanced features

Beginner event solo challenge Bulbasaur Ivysaur Caterpie Metapod Weedle Kakuna Oddish Gloom Paras Bellsprout Tangela Cottonee Skiddo Poke Ball First time rewards: 8x Pack Hourglass, 50 Shinedust, 1 Shop Ticket, 25 player experience Chance rewards: 1x Promo pack (51%), 25 Shinedust (100%), 1 Shop Ticket (38.7%) Intermediate event solo challenge Bulbasaur Ivysaur Venusaur Caterpie Metapod Weedle Kakuna Paras Scyther Farfetchd Poke Ball Professors Research First time rewards: 4x Pack Hourglass, 100 Shinedust, 1 Shop Ticket, 50 player experience Chance rewards: 1x Promo pack (64%), 25 Shinedust (100%), 1 Shop Ticket (48.3%) Advanced event solo challenge Bulbasaur Ivysaur Venusaur EX Paras Parasect Skiddo Gogoat Farfetchd Kangaskhan Tauros X Speed Poke Ball Professors Research First time rewards: 6 x Pack Hourglass, 150 Shinedust, 1 Shop Ticket, 75 player experience Chance rewards: 1 x Promo pack (80%), 25 Shinedust (100%), 1 Shop Ticket (60.4%) Expert event solo challenge Bulbasaur Ivysaur Venusaur EX Petili Lilligant Kangaskhan Erika Sabrina Professors Research X Speed Poke Ball First time rewards: 8x Pack Hourglass, 200 Shinedust, 1 Shop Ticket, 100 player experience Chance rewards: 1x Promo pack (100%), 25 Shinedust (100%), 1 Shop Ticket (75.5%) READ MORE: 3 best beginner decks in Pokemon TCG Pocket

Recently, the price difference between English and Japanese sets has been fairly close, but before the hype