Not only do you need to be consistently attacking with your Commander or blinking it to get the most out of this enchantment, you also need a high density of legends in your deck to maximize the effect
This, by the way, is what I meant when I talked in Arabian Nights about how MTG would use the named Land cards to showcase the setting of the storyline
Omniscience Omniscience sees plenty of play in EDH decks that play spells without paying their mana cost, Legacy Show and Tell decks, and more
Perhaps even more unexpected is Imps Mischief
Time Stop Although it costs 6 mana, Time Stop has the flexibility to work on your turn and on your opponents
But if you want something truly wild to build around, Orvar, the All-Form is one of the most fascinating card designs Ive seen in a while