Doubling Season with Storm the Festival bugs on planeswalker
When casting Storm the Festival, if you hit Doubling Season and Teferi Hero of Dominaria (or likely any other planeswalker, but it was with this one that I tested this 2 times), Teferi comes into play with only 4 loyalty. Whereas, as I understand it, the counters are placed once Teferi and Doubling are in play, so they should be doubled to 8.
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Archtl#58872 commented
Issue resolved. Counters now properly double.
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[Deleted User] commented
A replacement effect has to exist to replace an event, and for this specific snenario, this means, DS has to be on the field ALREADY, because its abilities are only active while it is on the battlefield, thus only then do the replacement effect exist. Entering at the same time as a planeswalker means, the effect cannot replace the planeswalker loyalty count, because it doesn't exist yet.