Its worth noting that until Battle for Zendikar, the cheapest Eldrazi the temple could ramp out cost 7 mana (making Eldrazi Temple quite similar to [casthaven]Shrine of the Forsaken Gods[/casthaven]
Each card has its own special ability that players use to defeat their opponents, creature cards for attacking, land cards for generating mana, etc
Like most Magic: The Gathering cards, the value of Wrenn and Seven depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Innistrad: Midnight Hunt)
For Commander, it gets stronger the higher the power level gets since youre more likely to encounter free spells like Force of Will and non-land mana acceleration
While the base damage of Full Moon Rondo is only 20, it does 20 more damage for every Benched Pokmon on the field, both on your side and your opponents
For four mana, two of which have to be Blue or Green, you get to mill two cards and then you can return a nonland card of an opponents choice from your graveyard to your hand