You dont need to get around hand size restrictions as much, and Crypt Ghast also provides a form of extra mana and plays into your overall strategy, so this seemed like a good swap
I spent the majority of my first 10 hours in Arena playing against Sparky, trying out each of the decks in turn and raising my account mastery level to unlock more cards
If Dragon decks ever start running rampant in the meta, maybe you will want this card but definitely not now
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Stone of Erech - While I dont think this is necessarily an upgrade on Soul-Guide Lantern or Relic of Progenitus, it does get points for shutting down creatures entering graveyards