Living Plane, for example, allows both players to turn all their lands into 1/1 creatures, represented by this forest coming alive and strangling a poor man
Whats more, it doesnt exile it from the yard, so youre free to cast Reanimate or Animate Dead or other variants to fish the original out when you want, too
For two mana, Expressive Iteration allows you to dig for a key spell and a land, just so long as you havent played a land for the turn yet
Mario vs
Unfortunately, this Gideon doesnt kill creatures (lets be real, for one mana that would just be way too powerful to -2 to kill a creature) but it can boost its loyalty very quickly and mess with your opponents combat
We could tutor for each individually and cheat them out with something like Omniscience