Wonder Balloons is a continuous spell where once per turn you can activate its effect to send any number of cards from your hand to the graveyard, and then place a counter on this card for each one you sent
If you're not in Black/White, Hour of Devastation does compare favorably to other available Red wipes: Chain Reaction and Blasphemous Act can be superior creature wipes for less mana but also have consistency issues, Earthquake is more flexible but costs an extra mana and doesn't hit flyers, Rolling Earthquake is a superior Earthquake but still doesn't deal with indestructible creatures and isn't as effective at killing multiple planeswalkers (Superfriends)
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Mythos73 didn't specify the playstyle for this deck
Similarly, a creature whose toughness is doubled gets +0/+X, where X is its toughness as the effect begins to apply
These terms let us find creature cards with power, toughness, or mana value that fit certain numerical parameters