Doubling Season has a textbook example of a replacement effect: The key word here is instead : Doubling Season overrides the normal effect that would have happened (create X tokens, put Y counters) and replaces it with a different effect (create 2X tokens, put 2Y counters)
Jetmir, Nexus of Revels [Best Token Commander for Combat Buffs] Best complemented with top dual lands, Jetmir is one of the best token commanders you can build your strategy around
Then if you cannot you'll lose the game
Not necessarily in Aggro decks, which dont tend to run discard effects, but rather in Rakdos Midrange
Most of the time cards that have it end up having to be watered down or costed up dramatically, because when you don't do that then players have a tendency to die
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