7th Edition

Casting Cost: 

At the beginning of each player's draw step, that player puts the cards in his or her hand on the bottom of his or her library in any order, then draws that many cards.

: Add 1 to your mana pool.

: Add  or  to your mana pool. Underground River deals 1 damage to you.

Casting Cost: 

Whenever a Forest is tapped for mana, its controller adds  to his or her mana pool (in addition to the mana the land produces).

Casting Cost:

If you control a creature, damage that would reduce your life total to less than 1 reduces it to 1 instead.