Landfall Whenever a land you control enters, Birds you control get +1/+0 until end of turn
Then when you cast a non-dork, you can give this indestructible too to really surprise everyone
The attacking creatures, which get untapped, are then ready to tap down potential blockers (without removing themselves from combat)
A non-foil extended art version (5.3%) or a traditional foil extended-art version (3%) of 7 of the 8 Commander mythic rares can be found here as well, with Ulalek, Fused Atrocity being the mythic rare not included in extended art
Upgrade 5 Lets start with the cut
This would sum up the second branch you could take this core to: There are many other variations than just those three, but I think that those display the most viable options