Precognitive Perception
Card draw has long carried a hidden tax: hold the spell for the end step and stay safe but passive, or fire it while you still have plays to make and advance your plan while tapping out. Addendum answers by refusing to price either mode out of existence. Held to the end of an opponent's turn, this is a flat triple-draw, a reactive dig you can keep as a bluff or fire when an opponent overcommits; commit to it while developing your turn and the reward is scry 3 stacked in front of the draw, letting you bin the lands you no longer need before you draw into them. At five mana it never masquerades as a tempo play, which frees the design to be a pure control payoff: the refuel that arrives once the deck has already reached its fifth land untapped and unbothered. The scry rider looks minor on the card and reads large in practice, because filtering the top of the library ahead of a three-card draw is precisely the consistency a grinding deck turns into wins over a long game. What Addendum resolves here is a decades-old friction in blue's card advantage, and it resolves it by letting the board state, not the deckbuilder, choose which half of the card shows up.
