A Tinker
Regenerate can pretty much keep your creatures alive given the proper resources, unless your opponent drops a regeneration-preventing nuke like Death Pits of Rath
Unlike some 1-mana cards
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Typically the kinds of deck that want coverall counterspells also want to leave mana up to be reactive, having to tap five mana in your upkeep will make the turns following a Pact of Negation deeply uncomfortable until you have lots and lots of mana