mtg cards like elixir of immortality Graveyard Shovel (foil) - Innistrad Shuffle Elixir of Immortality and your graveyard into your library. Elixir of Immortality | Magic:

Combined with free burn damage from Creeping Chill, this is generally enough to end games quickly

Plus, score exclusive Crystal Counter d10 Spindown dice and special promos when you register with your Wizards Account

Lots of characters you probably can't challenge with a large amount of Evasives from Ruby and things you don't really want to challenge in Emerald's toolkit

Even then, it's still nowhere as good

You can craft combos that you'd never be able to pull off in a mono-blue deck, but at that point all you've done is sculpted your own 2-color combo that you could've built into an actual 2-color deck anyway

I very recently talked about the problem with Infect in Commander