Like expected, all three weekly winners involve cards that were run in Modern decks during Pro Tour FRF last weekend. Due to time constraints a more consise version of Weekly Winners. But anyway, just in time for FNM, I present you the cards that will be the talk of the town tonight.
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Wild Defiance shows a big percentual increase, but look out: it was so cheap before that even a mild increase will make it pop up in our interests. In this case, the card gained around $2 in value over the past week.
Wild Defiance sees play in Modern Infect decks, mostly in sideboards and usually only one copy is played (there are decks that play 2 copies mainboard). The reason is obvious: landing a Wild Defiance means that your pump spells will be a lot more powerful, and, that your creatures are much harder to remove with targeted burn spells. Your opponent can forget bolting your creature.
Summer Bloom is a piece in Amulet Bloom (or Hive Mind) decks in Modern. Justin Cohen reached the Pro Tour final with this deck, putting it in the spotlight for a huge, huge crowd.
Forget "two explores": with Summer Bloom you get three additional landdrops in your turn. And in a deck that plays 27 lands, that is a lot, and it will enable you to get ahead in the match and start comboing out.
Check out the Pro Tour final to see how the deck works.
Don't expect Summer Bloom to rise too much more, it has been printed in Visions, Sixth Edition, Portal, Starter and 9th Edition. And it is an uncommon. So there will be a lot of supply, many players will have spare copies of this card in their collections, and when you can get $2 to $3 trade value out of them it's an easy card to get rid of.
Amulet of Vigor is that other piece of tech that enables the Amulet Bloom deck. Because it is a rare and only printed in one set the price of this card is higher than summer bloom.