Unblockables (help)

i have several conundrums that need solving. should i go with see beyond or preordain in that slot. preordain costs less but the other one lets me draw 2 and get rid of something unneeded. plus i already have plenty of 1 drops. next should i run spellblade or invisimancer in the main deck i feel with d strike and tunneler its enough but the it would pretty much assure i always had something unblock-able. finaly should i keep tectonic edge in my sideboard or replace it for 3 flings in case i run into a removal heavy deck. with fling even if they do kill my kiln when he attacks i get to buff him once more and hit anyway. tectonic edge and ignus or for ramp\valakut