Kaya's Onslaught

The tension every combat trick carries is that it does nothing until the block declares, and it costs a card the moment you flash it, so a whiffed trick is a two-for-one against you. Foretell answers half of that problem: paying to set it aside face down turns the trick into information your opponent has to respect without knowing what it is, and the discounted cast on a later turn means you have already sunk part of the price before the fight arrives. The double strike is what makes this more than a pump: it doubles combat damage rather than adding to it, so the +1/+1 is incidental. The point is that a modest attacker suddenly deals its whole power twice through, either trading up into a bigger blocker in a single exchange or shoving lethal that no static bonus could reach. The foretell shell also disguises the threat: an opponent staring at a face-down exiled card cannot tell a pump from a counterspell from a removal instant, so the deterrence goes to work before you have committed to anything. That is the real design lever here. The reveal window does labor the printed effect alone never could, letting you bank a blowout a turn early and hold it over the board as a question the opponent has to solve without knowing what it asks.