When Slagheap Bridge enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
Put Slagheap Bridge on top of your library: Add to your mana pool.
Cycling (, Discard this card: Draw a card.)
: Add 
or 
to your mana pool.
to your mana pool. 
(, Discard this card: Draw a card.)
