Pointed Discussion

if you prefer this enchatment in white, i'd advise to use Rule of Law.

Arcane Laboratory is much better for blue than Rule of Law is for white because blue specializes in instants, thus offering more of an opportunity to play one spell during both your turn and your opponent's. You'll also very often be countering your opponent's one spell during his or her turn, and then he or she won't be able to cast any more.

Erayo's Essence

Combine this with Isochron Scepter and Counterspell. Complete lockdown.

Not quite a complete lock, you need Teferi, Mage of Zhalfir for a true hard lock.

Krosan grip stops your lock

Would Arcane Laboratory conflict with cards with Suspend? Like having two cards with one time counter on them, would 'playing' both of them conflict with only being able to play one spell per turn?

@PhilJol: However, "play", which IS still used in the rules and why it's used in the M10/M11 wording, refers to "casting a spell or playing a land during the Main Phase special action". I'm also no rules expert, but it seems that under these definitions if something with suspend resolves, that's your spell for the turn.

@SeiferKnight: A better place ask would be the rules forum, but here is my taken on it:

The word "play" has been updated to "cast". Suspend's first ability (Suspend has three parts, the original cost, the upkeep and counter removal, and the actual playing of the spell), after looking at the rules, doesn't use the stack. So I don't believe that would be considered "casting".

However, the third part reads "When the last time counter is removed from this card, if it’s exiled, play it without paying its mana cost if able. If you can’t, it remains exiled. If you cast a creature spell this way, it gains haste until you lose control of the spell or the permanent it becomes.” I take this to mean that, if the effect successfully happens, you just played the spell.

For reference, "cast" means "To take a spell from where it is (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect." With the third ability of suspend, you are taking the spell, putting it on the stack, and paying its costs.

A lenghtly answer, but an answer nonetheless.

@djbon2112: That was the conclusion I got to. Just with a lengthly explanation.

Combine this card with howling mine, temple bell & co. and add forbid = Tada, you dominate the Board and you opponents can't do squat :D

I'm pretty sure this was intended to be used in blue red and green werewolf decks

It may be one more and not in normal control colors but I like Curse of Exhaustion for this purpose better.

Every EDH group has that one douche who insists on playing stuff like this. Just thinking about it makes me tired.

Knowledge Pool + this is a true lock. Beats Krosan Grip, but still vulnerable to permanents already on the battlefield, and flashback spells already in the yard.

@littlebeast: This is indeed good for locking down EDH games the only thing is you need to be sure that Erayo has flipped before you play Arcane Laboratory otherwise your screwed as Arcane won't allow Erayo's to flip and you want its flip ability.