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But we haven't seen a UB yet and with only 128 cards I'm doubtful

Fathomless descent abilities are very similar, but rather than specifying a required minimum number of permanent cards in your graveyard, they just get more powerful the more you have

Gwynn is a new Supporter card that allows the player to discard up to two non-Rule Box Pokemon from hand and draw three cards for each card discarded

It severely weakens their ability to react and then takes them out some other way while they are in a weakened state

So in a theoretical offensive situation, you can perhaps transform another battle with it, while pinging a potential defender to push more damage to any other relevant target(s)

For instance, you might use a creatures tap ability to deal damage or draw cards right before it would be destroyed by an opponents spell