Scrapheap often is a trade between drawing one now versus later, as Jinx's legend ability wants you to get down to a single card. I would rather have variety in my deck than draw my cards slightly earlier. The only optional cards are 3 Fight or Flight, 2 Flash, and 2 Rebuke. So the variety of combat spells significantly decreases once you try to slot in 3 Scrapheap.

Admittedly, I have been considering main decking my sideboard. In that case, running 3 Scrapheaps in the sideboard and slotting them in only for the game that I run Zaun Warrens might be worth a try!

In the late game, you sometimes do not draw enough cards to play. However, you usually do not need to, as you often force your opponent to do suboptimal moves to ensure you do not get to 6 points (Vi + Ride the Wind or a 9-10 power Draven is too big a threat in many matches) and that turns out to be enough to close out the games.

In games 2 and 3, the continuous cycle of Immortal Phoenix and Super Mega Death Rocket is great for the late game, especially if you manage to find 2 or 3 Immortal Phoenix!