Consider what they discard, what they create, and how well they help the rest of your deck do what it already does best
Over $50 (Premium) Gaea's Cradle ($400+), Serra's Sanctum ($200+), Mishra's Workshop ($1,500+), The Tabernacle at Pendrell Vale ($2,000+), Imperial Seal ($50$80), Force of Will ($60$100), Lion's Eye Diamond ($150+), Mox Diamond ($300+), Chrome Mox ($50+), Survival of the Fittest ($100+), Intuition ($80+)
Later on, however, this cards going to be a wonderful mana sink in an aggressively leaning green deck, which decks like this always want
Soul Sear is another one that does damage at the same time, if you were looking for a starting point to wreck your indestructible friends