If you blocked, you risked them unmorphing into something bigger that would beat your creature in combat
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1 Ichor Wellspring
Multiple mana symbols, useable removal, plus it gets us another card at death
Much like with morph and manifest, I can turn her face up for her disguise cost
I think Id rather run more consistent payoffs for the strategy, like Aid from the Cowl, but you know theres going to be that one time where youre at five life, the outlook is dire, and you sacrifice all your lands in a desperate attempt to live only to be pleasantly surprised when deforestation is to your benefit for once