Oh, and did I mention that if you draw three cards, lose two cards, and have a Psychatog on the table, you've just grown your 'Tog by +6/+6 (two cards in graveyard + Fact or Fiction + 3 cards in hand -- discard the three cards to have six in the grave, remove all six to give another +3/+3)
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The printing of Frogmyr Enforcer let us know that prototype's still in the designers' back pockets if they ever wanted to use it again, though that card was too clever not to make, so maybe it wasn't an indication of prototype coming back any time soon
You can also sacrifice a dork to recast it and recur a key artifact to your hand that you may not want to cast (or you may want to cast as well
You can see the full details of all the stores mentioned above on the Yellow Submarine official website