This spell costs less to cast for each land card in your graveyard.
Flying, haste
Illustrated by Aaron Miller · Jumpstart: Historic Horizons · #493
There are no rulings for Ore-Scale Guardian.
This spell costs less to cast for each creature in your party. (Your party consists of up to one each of Cleric, Rogue, Warrior, and Wizard.)
Haste
This spell costs less to cast for each instant and sorcery card in your graveyard.
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When this creature enters, discard your hand, then draw three cards.
This spell costs less to cast if there is a land card in your graveyard.
When this creature enters, you may have it deal 2 damage to target creature.
Flying
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Whenever you cast a spell with cascade, return this card from your graveyard to your hand.
, Exile this card from your graveyard: Each player discards their hand, then draws seven cards.
This spell costs less to cast, where X is the number of cards in your graveyard that are instant cards, sorcery cards, and/or have an Adventure.