Being able to maintain parity might be all you need and having a card that can keep you a bit safer early on and then go on to lock someone out of the game entirely is nice, it just requires fairly specific decks
Jund Turn 1: Play Blackcleave Cliffs, Inquisition seeing Swiftspear, Soul-Scar Mage, Manamorphose, Burst Lightning, Lava Dart
The low cost of four ink makes him easy to deploy for mid-game disruption, while his six Willpower and Evasive ability helps him stay put
9 Froghemoth Bloomburrow promises to be a plane of particularly fantastical creatures, featuring animals going on epic fantasy quests
If you get a little extra luck it will only deal two damage to your opponent as well
Guardian Project is a whopping 2cmc cheaper than Soul, and being an enchantment instead of a creature means it's far more likely to stick around and not die to a random Wrath of God