The HORSE format consists of alternating rounds of Hold'em, Omaha Hi/Lo, Razz, 7-card Stud and 7-card Stud Eights-or-better. One can't help but feel that the last couple of letters are somewhat forced. There's also HOSE, which is the same but without Razz.
Magic: The Gathering players have a mnemonic guideline for drafting. Put it all together and it spells BREAD:
Bombs — high efficiency, high effect. good enough to make you throw out any deck building concept you might have had beforehand.
Removal — cards that remove other cards.
Evasion — creatures that are hard to block (flying, shadow, etc.)