Assemble the Shiniest of the Shards of Alara Block
While most lists like discouraging other players from attacking by simply preventing them, I prefer to leave the door open up punish them for attacking instead
You can go overboard with this sort of thing on volume (Im looking at you, Signets!) and Farseek was once a format-defining card in Standard, but I dont find that Sakura-Tribe Elder is all that difficult to balance around in Cube
Land destruction is already important to stop these kinds of decks running away with the game, as theres simply no way of keeping up with their ramp otherwise
Draconic Destruction (Red-Green)
You prefer a wedding ceremony in a church, a backyard, or an inconveniently distant location that will require guests to spend inordinate amounts of money just to reach it in addition to buying gifts and paying for the cash bar