If you are playing in a format that uses only N or R cards, it should provide quite a bit of protection thanks to its DEF
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The regular version of this card has the standard coloring, while the Hyper Rare pictured above is rendered in beautiful rainbow
As with Energy Tap, the best way to get as much bang for your buck with an effect like this is to play creatures that have extremely high mana costs that become manageable to cast via cost reduction
For one, these cards can be quite valuable, especially if they're in good condition
German TG-SX1 Wenn ein T.G.-Monster, das du kontrollierst, ein Monster deines Gegners durch Kampf zerstrt und auf den Friedhof legt: Whle 1 T.G.-Synchromonster in deinem Friedhof