Mana Drain is an instant that counters a spell for two blue mana, then gives you mana equal to the spell's cost at the start of your next main phase, effectively stopping any spell and turning it into mana
However, as I've said elsewhere I definitely let that bleed over into other cards that don't necessarily deserve it, so I've done some scryfall diving to see what I might have missed
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Once you know the mechanics its easy to get lost in the world, so do a Quick Draft or test your deck-building skills
We've got three decent board wipes in Crisis of Conscience , Time Wipe , and The Night of the Doctor , a decent number of mana rocks and ramp spells, and a few good instant-speed answers to ensure that a few crucial combat steps go your way