Individual bending abilities like Waterbend, Earthbend, Firebend, and Airbend can work outside the set, sure but Avatar Aang himself becomes much harder to build around effectively, especially if your goal is flipping him consistently
Of course, you will need a strong base of Giant creatures to stay on board for this effect to work, which shouldn't be too hard in the Kaldheim meta, where Giants are favored not only in quantity, but also in quality
From memory Shadowspear was around five USD the first few weeks after THB released Because of its relevance in the Theros story arc, I think were mainly going to see it getting reprinted in supplemental sets or universes beyond sets because reprinting it in Amonkhet or Lorwyn would make little sense
Each pack contains one foil card of random rarity, two rare or better cards, three uncommon cards, and six common cards
Culling the Weak Weve looked at a few cards that sacrifice creatures to generate mana, but Culling the Weak does it the best because it turns a creature of any size into 4 mana