Yes, the restriction is relevant, but remember this includes equip costs, the hour counters on Midnight Clock, a second trigger with Strionic Resonator, or a copy from Isochron Scepter

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There's no single answer, but here's how I'd think about it: If you just want to build and share decks , use Moxfield
Wizard of the Coast, the company responsible for designing and printing MTG, have been experimenting with more complex ward costs (like Saruman of Many Colors), so its likely theyll keep exploring this mechanic further in future sets