Tasigur is very much a viable tier 1 commander
As a special treatment, however, Wizards will occasionally print Planechase cards in Commander Precons
With such a potent answer like Unholy Heat, most of the creatures and Planeswalkers are easily answered, so decks have to play a lower curve threat package to not trade big mana threats against a single Unholy Heat
While some might see it as an odd choice for Universes Beyond, the amount of hype around the upcoming release of the Doctor Who Commander (WHO) decks is significant
None of these instantly wins the game, but all of them are a great boon to an artifact deck and can keep it running smoothly
Inscription of Ruin Im a sucker for modal spells, particularly when at least one option is relevant in any given match-up