The downside is that it deals 30 damage to itself, but this move alone can turn the match around
$20 for all 6 cards, that a bit over $3 each (LIST OF CARDS BELOW) ( I can toss in a random 151 holo, if the above isn't good enough, BUT it must random as I don't want to go and forth on picking
Aside from battling, you can also trade cards (it is a trading card game, after all) with users through an online trades marketplace, where you can put cards up for offer and browse cards other users are offering
Abilities are not Attacks
They're particularly excellent in monocolor decks, where they straight up boost your whole deck
The three black, 3/2 zombie enters the battlefield tapped, but gives your opponent two damage right from the off, just so they dont think theyre getting off easy