Camouflaged Crocodile

Instead of paying Camouflaged Crocodile mana
cost, you may hide it under another permanent
you own. While it's hidden, it has phasing. You
may reveal Camouflaged Crocodile as an instant.
If you do, it gains first strike and reach until the
end of a turn. Sacrifice the permanent, under
which Camouflaged Crocodile was hidden.
If the permanent which is still shrouding
Camouflaged Crocodile leaves the battlefield,
sacrifice the creature.