Once you get to 12 counters, these planets become some of the most powerful lands in the game (Tolarian Academy, Gaea's Cradle)
Consider a simple value play like putting a Solemn SimulacrumSolemn Simulacrum under the Siegebreaker, netting you three lands and three cards in each combat that you have both the Siegebreaker in play and a full roster of opponents
A card like this should have a weakness
Dunland Crebain Saruman of Many Colors Storm of Saruman Pippin's Bravery Fangorn, Tree Shepherd Nasty End Foray of Orcs Last March of the Ents Quickbeam, Upstart Ent Battle of the Pelennor Fields Battle of the Pelennor Fields scene is included in Tales of Middle-earth set, LTR draft boosters, and LTR collector boosters
Experimental Synthesizer The little two-for-one that could, Experimental Synthesizers among my favorite cards that came out in recent memory