Both cards are from prophecy.
Well of Life cost 4 mana
At the end of your turn, if you control no untapped lands,
you gain 2 life.
Chimeric Idol cost 3 mana
Tap all lands you control. Chimeric Idol becomes a 3/3
artifact creature until end of turn.
Most of the time tapping all your land takes planning and luck, thats where Chimeric Idol comes in. Tap all your lands with Chimera and you get a 3/3 creature plus an additional 2 health which may come in handy.
Nathan Duncan