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"I had entirely forgotten about it

This is especially the case since youre prepared to use it

Actions can be anything from removing an opponent's cards from play, adding cards to a player's hand, or giving a player extra moves or actions during a turn

For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Zack Fair's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature.

The amount of damage that Slickshot Show-Off can do with the right combination of cards can lead to game wins as early as turn three

Again, the combination of high cost and unpredictable payoff just goes against the accepted logic of competitive Magic