Threats are the most important part of Modern, and answers arent as ubiquitous as they are in other formats
This format's equipment is mostly attached to creatures, and after those trade in combat, you're left with a game piece to spend excess mana on
What would you rather have against basically any of them
So many mechanics in Magic let you pay extra mana for some additional effect, which is exactly what kicker does on a fundamental level
It went on alongside Coalition Victory in 2007, came off again with Crucible of Worlds in 2009, went back on as a Banned as Commander card in 2010, before being firmly banned when Banned as Commander was eliminated as a category in 2014
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