+Stone, +Wall (4)
Defender (This creature can't attack.)
: Flowstone Wall gets +1/-1 until end of turn.
Whenever you discard a card, you may sacrifice Pitchstone Wall. If you do, return the discarded card from your graveyard to your hand.
At the beginning of your upkeep, change Wall of Tombstones's base toughness to 1 plus the number of creature cards in your graveyard. <I>(This effect lasts indefinitely.)</I>
Gatherer works better in the Companion app!