The value of X is calculated only once, as Siegfried's last ability resolves
Once a chapter ability has triggered, the ability on the stack won't be affected if the Saga gains or loses counters, or if it leaves the battlefield
The upkeep triggers stack on your turn, at the beginning of your turn, and then you move forward
Tenacious Underdog For a while, Tenacious Underdog has been one of the best 2-drops for black decks to run in Constructed formats because it has a reasonably substantial body that threatens opponents for massive damage very early in the game and its blitz ability can be used from the graveyard
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As a result, youre going to have to dig really, really deep to find playable generic mana ramp for mono blue Commander decks, and many of your best ramp options will likely have some form of limitation