Funnily enough, Sylvia is the more important of the two since its the one who actually benefits your dragons
Sephiroth, One-Winged Angel Legendary Creature Angel Nightmare Avatar Flying Super Nova As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with "Whenever a creature dies, target opponent loses 1 life and you gain 1 life." Whenever Sephiroth attacks, you may sacrifice any number of other creatures
However, youll want to keep getting use out of your Elvish Reclaimer, so my recommendation for early turns is to grab Survivors Encampment or Holdout Settlement
I never expected to be so excited about a mana dork Commander, but here we are
Check with your local game store on what events they're hosting and how to receive this awesome promo!