Poison counter Commanders like Fynn the Fangbearer want proliferate cards to help them get their opponents up to 10 poison counters to close out the game
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Some of that is just good fortune in how all these effects are worded, but Id say its more that discarding is an inherently effective way to interface with Magic s core mechanics
The payoff of creating tokens for casting noncreature spells is the main focus
I don't think there's a right answer, but I came to my own conclusion as a guiding light for this project
Standard has plenty of all three of those at the moment, so Barricade is a solid answer to bring in from the board