The Ring

You may only play this card if Lu and Katherine are both on the battlefield.
Lu and Katherine become Engaged in
addition to their other types.
Lu and Katherine gain Indestructible and
Hexproof in addition to their other abilities.
Place three +1/+1 counters each on Lu and
Katherine.
—
"This diamond, flawless. My diamond, flawless.
This rock, flawless. My rock, flawless." -Beyonce