Buying Eternal Masters

From my experience of buying Legacy cards in February, I recommend players not to predict the price movement of a single card, instead they should buy a collection of all "unrestricted/unbanned" cards.
The collection must exclude these cards:
Mana Crypt
Mystical Tutor
Necropotence
Vampiric Tutor
Brainstorm

Besides, I don't like cards reprinted for too many times:

Jace, the Mind Sculptor

Force of Will (this one is arguable, it's a safe choice)

My plan is buying a number of all EMA cards from Tuesdays to Fridays til its promised limited event ending date. The reason for not buying all you need in one day is that: it's not sure if WOTC extends the period of EMA drafts and if they give out EMA packs as prizes for events. (It has happened in Vintage Masters marketing that they massively hold Vintage Masters limited events for a very long period.)

The fear of loss must be overcome as now is the best chance to buy with the least risk.