While I think a Commander like Sidar Jafar of Zhalfir is a little more constricting in terms of deck design compared to a Commander like Y'shtola, Night's Blessed, I do really like all the intricate synergies you can include in a Sidar deck You also have multiple ways to protect your board state from sweeper effects, like Knights' Charge and Guardian of Faith

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When LotD came out, the then-newest mechanic of Pendulum monsters was seeking its footing and identity
While there might be an infinite combo lurking somewhere, it would be difficult since Jetfire, Ingenious Scientist Converts after using the Mana ability, and an additional 3 blue Mana is needed to Convert back
These decks were reliant on one particular card to do this, as Grinder Golem created multiple tokens with its effect, and it could be used in conjunction with link monsters to be utilized multiple times in a turn
In fact, with Luffy s effect, we can actually turn that drawback into an advantage