Ssatu, Ophidian Infiltrator

Ward {2}
When Ssatu, Ophidian Infiltrator enters the
battlefield, gain control of target creature an
opponent controls until end of turn. Sacrifice it
at the beginning of your next end step if it has
converted mana value 3 or less or if it is a noble.
If you control a dragon, snake and naga creatures
you control have "{g}: this creature gets +1/+0
until end of turn"