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Galloping Lizrog Sometimes you dont want a wide board of counters, and Galloping Lizrog gives you the option to consolidate them

This can scale up quickly, especially with some support

And then there's The Hunters

It takes some finagling, but this could help you keep cards that are meant to only last a single turn on the battlefield for an indefinite period, and if you double up on Warp effects with someone like Tannuk, you can get stuff like the previously mentioned Blightsteel Colossus on the field permanently that much faster

Because those cards could target ther Flash either in play, while being cast, or in hand, you could use any of them to remove it from that stack

Exile Ascend from Avernus