https://www.mtggoldfish.com/articles/much-abrew-mono-red-dragons-pioneer-magic-online

"I'm not sure it's actually worth splashing for Dragonlord Atarka and Kolaghan, the Storm's Fury. While both cards are powerful, we only have four Sarkhan, Fireblood, four Haven of the Spirit Dragon, and one Crucible of the Spirit Dragon to make the off-color mana we need to cast them. In some games, this left us in the awkward position of having really powerful cards in hand but not being able to deploy them in a timely manner. Next time I play the deck, I'm planning on cutting both for more copies of surprise all-star Dragon Tempest while also finding room for a fourth Dragon Egg."