when you've been grinding for weeks to get magnet reverse for your magnet warriors deck only to realize its crap since you can't use it if you summoned valkyrion with deltas effect.... :
Magnet Warrior Fossil Fusion - YGOPRODECK
Yu-Gi-Oh! TCG Strategy Articles » Magnet Warriors Pull it Together!
Delta The Magnet Warrior - Yugioh | TrollAndToad
Magnet Warrior Sigma Plus by ChaosTrevor on DeviantArt
Yu-Gi-Oh! TCG Strategy Articles » Magnet Warriors Pull it Together!