Scarlet Witch: I have questions regarding the card Spiritual Meditation, which has the effect: “Draw 2 cards. Choose and…

Question

I have questions regarding the card Spiritual Meditation, which has the effect: “Draw 2 cards. Choose and discard 1 card from your hand.” Do the Choose rules prevent me from playing Spiritual Meditation when it is the only card in my hand? The Choose rules say that if there is no valid target, then the ability cannot be initiated. Would the single Spiritual Meditation in my hand be a valid Choose target just to initiate the ability? Am I able to change the Choose target after initiating the ability? More specifically, am I allowed to Choose one of the 2 drawn cards by Spiritual Meditations first sentence after Choosing a card that was already in my hand to initiate the ability in the first place?

Answer