Tap Merieke Ri Berit to gain control of target creature.
Have a creature enter the battlefield.
Merieke Ri Berit untaps, repeat loop.

Currently being used to describe Merieke Ri Berit gaining control and then later destroying

Destroy any creature whenever a creature enters the battlefield

Merieke Ri Berit

Intruder Alarm

Activate Merieke Ri Berit's own ability by tapping it, gaining control of target creature as long as you control Merieke Ri Berit and creating a delayed triggered ability.
Untap Merieke Ri Berit by any method.
Merieke Ri Berit's delayed triggered ability triggers, destroying the creature you gained control of.
Merieke Ri Berit's ability from Thornbite Staff triggers.
In response, activate Merieke Ri Berit's own ability by tapping it, gaining control of target creature as long as you control Merieke Ri Berit and creating a delayed triggered ability.
Resolve the ability from step 4, untapping Merieke Ri Berit.
Repeat from step 3.

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