pokemon cards beginner set Best Starter Decks or Alola region Best Pokemon Cards for Beginners

One in three, multiplied by the collation of rares/mythics to commons/uncommons gives you 5.3%

Having a 50% chance to get a natural 20 is also much better than its typical 5% chance, meaning youre more likely to get the best effects off any dice-rolling cards

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

The incidental life gain is helpful for later turns as well, presuming you somehow haven't won the game by casting this creature spell