herd migration with all land types available, 6 land, and 2 mana from planeswalker, and would not cast.
8 mana available and herd migration would not let me cast it.
2
votes
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Sir_Mantics#22796 commented
Just had this happen in the midweek standard event with the domain deck. Leyline Binding's domain feature worked just fine, but Herd Migration's cost didn't change at all. Even once it would let me cast it, it still took all 7 mana. I've had a similar issue with the instant side of Heartflame Duelist not registering as an allowable cast even with the mana available.
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[Deleted User] commented
The mana from Lukka, Bound to Ruin's ability can only be spent to cast creature spells or activate abilities of creatures. Herd Migration is a sorcery spell and therefore cannot use that mana.