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I think the lack of ability text helps it

If that card is an enchantment card, it enters tapped and attacking." Abraxas Equip Equipped creature is a Shaman in addition to its other types and has "Whenever this creature attacks, you may put a creature card from your hand onto the battlefield

Teysa Karlov stands out among the best token commanders in MTG with her fantastic ability that doubles the effects of death triggers

Then you can simply sacrifice them to something like Goblin Bombardment or just have a card like Warstorm Surge deal damage to your opponents

Its also worth noting that this does not pass priority to your opponent, so you can still do something immediately after morphing a creature

Expect to see this one in Commander quite a bit