Techform

has the abilities and 1 more power and toughness (x+1/x+1) of any card you choose, (add It's casting cost to this card's casting cost)
as well as It's own abilities
stealth, cards cannot attack it until it does something
{t}{e}{x}{1} powers- it does x elemental damage
to target card based on the land tapped
due to It's being able to be an elemental version of any object, It's naturally quite sneaky, and quite powerful