Heres a card which ensures you can mount a serious clock on your opponent
I think this will be a little underplayed
You don't choose a target for Hydra Trainer's first ability at the time it triggers
The only decks that existed for some time were ramp decks featuring Field of the Dead, and 22 Small Probe, Big Problem (Gitaxian Probe) Sometimes, it only takes a small and unlikely spell like Gitaxian Probe to cause some serious damage
This includes world-class spot removal like Swords to Plowshares, and white has access to flexible board wipes like Farewell, Winds of Rath, and Everything Comes to Dust that can obliterate opposing boards while leaving yours untouched
Lay Down Arms Lay Down Arms rewards you for playing mono-white, or at least a white-heavy deck