Firstly Sky Swallower works with a wider selection of the cheat effects than Progenitus does
Enchantment payoffs do not all trigger the same way, and mixing them up quietly wrecks your deck: Cast triggers whenever you cast an enchantment spell. Argothian Enchantress, Enchantresss Presence, Verduran Enchantress, Mesa Enchantress, Satyr Enchanter, Sythis, and Sigil of the Empty Throne all fire off the cast
Creature - Rogue Faerie Mocking Doppelganger Flash You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded." (They attack each combat if able and attack a player other than you if able.) You may have this creature enter as a copy of a creature an opponent controls, except it has "Other creatures with the same name as this creature are goaded." (They attack each combat if able and attack a player other than you if able.) Creature - Shapeshifter Prosperous Thief Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.) Whenever one or more Ninja or Rogue creatures you control deal combat damage to a player, create a Treasure token
Being able to place even more giant bodies onto the field is always a super satisfying feeling, and this can be done repeatedly since your Xyz monster here has 4 whole materials
