If this card attacks an opponent's monster, during the Damage Step only, negate the effects of that monster while it is face-up on the field (but its effects can still be activated), also its ATK becomes half its original ATK
Hope you didnt have a Jump Scare
Opponent Your opponent decides to draw in the first or second game
Hydra Omnivore 8/8 for 6 is a fine deal, and Hydra Omnivore is a big threat to punish all your opponents if you have ways to give it trample or evasion
Damaged copies of the card can be had for around $100, but a nicer copy will cost you over $200
Green has a ridiculous amount of top tier, low converted mana cost (CMC) creatures, namely mana dorks like Birds of Paradise, which you can fill up with, giving the Soulcaller no shortage of creatures to return