I may be biased in my analysis but this discussion about Tome of the Infinite makes it really sound as if the Council of Colors is way more flexible with Green and Blue shares of the Color Pie than with the share of the other 3 colors...

In the last two years, we’ve allowed more changes to white than the four other colors combined, so yes, it’s observation bias.

I really don't like how cards like Mind's Dilation are used to justify Tome of the Infinite. I think there's a difference between stealing/copying something that's already inside the game, and getting effects completely at random.

Getting truly random effects wasn’t a possibility until digital effects existed. It’s just the closest effect that existed prior. And yes, I do think blue can get random spell effects (instant and sorcery) provided the pool is large enough.

Mind's Desire as a defense of Tome of the Infinite seems disingenuous. Mind's Desire can't give you out of pie effects unless you include those cards in your deck, and thus either accommodate their mana needs or risk drawing them dead. Tome gives you access to both cards that have abilities outside of blue's pie and a way to cast them without needing nonblue mana, in a single package. A blue card that randomly produced those effects directly would be a break 100%, conjuring seems like semantics.

Blue can also cast cards out of the opponent’s library which is even more analogous to this effect. And as the most spell-focused color, blue *is* the color that is able to cast random spells. The fact that it can’t control what the effects are is why it’s okay for blue, much like black gets any color’s enter the battlefield effect but only when it reanimates creatures. Colors can, through certain narrow restrictions, access effects outside their color.

I thought you said digital only cards had to pass trough the council of colors, Tome of the infinite is a color pie break no? it generates non blue cards and lets you cast them for whatever, effectively giving you access to effects that are not available on blue, discard, ramp, direct damage, fog, lifegain, doublestrike, unconditional exile.

Tome of the infinite still FEELS like a break though. Mono blue lightning bolts, dark rituals, enchantment removal … it doesn’t require any hoops to jump through except a little randomness

There’s a big difference between being able to reliably cast something and to potentially cast something. Interestingly, Mind’s Desire gives you more control than Tome of the Infinite on what card you cast because there are many cards that can manipulate the top of your library. EDIT: Oops. Mind’s Desire shuffles your library. Both are random. My bad.