mtg exile cards from the top of your library until Can be cast during any turn? Ignite the Future · Jumpstart

That's also a cast trigger so if the Eldrazi is countered, it'll still trigger

It's honestly absurd

It gives you a second shot at nailing your flips, making it twice as likely that any given flip ends up in your favor

While Subtletys ability is by far the weakest, countering spells for free is always good, even if it will likely just go on top of your foes library

For each nonland card milled this way, you lose 1 life and a rad counter." Chris Mooney developed the details of rad counters to make you lose life in a non-deterministic way

Commander Commander (CTRL to add secondary) Copy Sandstorm Crasher Trample You may exert this creature as it attacks