Seismic Shift

Land destruction at four mana is a rate the game long ago decided was too slow to matter on its own, so this design tries to buy that slot back by welding a tempo rider onto the Stone Rain: alongside blowing up the land, up to two of the defender's creatures can't block the turn you cast it. The intent is a single sorcery that strips a wall and clears the road, turning clunky disruption into a swing you close with. The trouble is that the two halves are fighting over which game you are playing. Destroying a land is what you do when you are behind or grinding; forcing creatures out of the blocking assignment is what you do when you are already ahead and swinging into a board that outnumbers you. Because the effect is cumulative rather than a choice between the two, you pay for both every cast, and in most spots one of them is doing nothing. Note the specific shape of the combat half: it does not make your attackers unblockable, it forbids two chosen defenders from being declared as blockers, so it only matters when those exact creatures were the ones standing in your way. The sorcery-speed clause slams the door on any ambush use; there is no holding it up to punish an alpha strike, just a main-phase commitment that wants the rest of your board to have already done the hard part.