Cyclonic Rift This is much more of a Commander card, but Cyclonic Rift demonstrates just how good it can be
However, if an additional cost includes a mana payment, you are forced to pay that cost only if theres enough mana in your mana pool at the time you cast the spell
Less flashy than Red or Purple, but quietly dominant
Note that it hits only opponents and their creatures, so its often a one-sided board wipe that can sit in the foretell zone forever to lurk and finish off the table at some point
Even without these specific synergies, the card is just a solid grindy value engine, however, so the floor here is pretty high
Before I get too far ahead of myself, I should go over the basic discussion of Okos play pattern that answers the question, Why is Oko so good? The answer largely comes down to Okos incredibly high loyalty, but theres a little more to it