If a permanent with a finality counter on it would be put into a graveyard from the battlefield, exile it instead
Twinshot Sniper also gets bonus points for having good types for Cubes with delirium support
Turning a land into a copy of a permanent opens the door to so many crazy plays
Nature's Rhythm (Borderless) (TDM-349) - Tarkir: Dragonstorm Foil Wizards of the Coast Sorcery Rare null/null Search your library for a creature card with mana value X or less, put it onto the battlefield, then shuffle
However, while Mega Evolutions are incredibly strong Pokemon, losing them in a match is more punishing, as one down means applying the 3-prize rule instead of the usual 1 or 2
The second and third levels may be a bit expensive for a deck that likely wants to be aggressive, but you really cant complain too much as an extra upside