It was a new type of mana (something we don't make very often), required a new frame, and interacted with deck building in a new way
Birthing Pod specifications: Pros Helps bring key creatures to the board A trigger for fun combos Cons High cost to trigger Sacrifice Sorcery speed Sacrifice only Birthing Pod is a staple in combo-heavy green Sacrifice decks
Krang, Utrom Warlord We heard you like keywords
Even thought these cards look great they do have the same stats and rules as their original cards, so these cards are primarily for collectors
2008 Sets : Morningtide , Shadowmoor , Eventide , and Shards of Alara My Pick : Reaper King ( Shadowmoor ) Morningtide was another typal set, this time focusing on classes rather than species
On top of that, you may also want to include some creatures that ramp such as Solemn Simulacrum , Burnished Hart, Palladium Myr, etc