For four mana, you get to search your library for any land card and put it directly into play - not even just a basic land, any land
61 cards For the numerically challenged, here is a pretty picture: Here is its effect on your mana ratio: % Chance of Hitting Land Drops by Number of Lands 60 cards, on the play 60 cards, on the draw 61 cards, on the play 61 cards, on the draw And some pretty pictures again: To show some graphs that have less action, I have selected two common land counts, 24 and 27, and graphed the 60 vs
For a small amount of damage to yourself every Pokemon Checkup, this massive additional damage is borderline broken on certain Pokemon, especially the legendary Unhinged Scissors Klawf
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Heres a few tips on how to improve your chances: Research Before Buying Packs
On the other side, Chaos Orb, which gave rise to one of Magic's first urban legends: the card was one of the weird designs from the early years of Magic that required physical actions to perform an effect - in this case, tossing Chaos Orb into the air and, if it flips at least once while in the air, destroying all permanents it touches