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If they play Coral Net on a mana producer, keep it along as long as needed to cast a monster and then let it die

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Theres also The Book of Vile Darkness, which fuses together with Eye of Vecna and Hand of Vecna to create Vecna, an 8/8 Zombie God that lets you draw cards, create zombie tokens and just generally be bigger than everything else

At least in Commander he'll be restricted by only playing one of each of those lands, but you can also rely on getting Jodah out on turn four and keeping him out, so I suspect it's a wash, basically

It was nothing fancy, but it was an effective weapon for fighting the top tier of that format