DDR#835 - Riftstone Portal + Crop Rotation

(1*) Can you sacrifice Riftstone Portal and use its ability to tap for the G needed to cast Crop Rotation? Support Judging FtW on Patreon at   / judgingftw   Suggest a question: https://forms.gle/YTK2qrQqTL18rRsJ9 A: No Bonus: Can you sacrifice Harbinger of the Seas to turn on a B source for Bone Splinters? A: No