After the initial hype of the Pokemon franchise, it did enter a lull phase where interest in the series dropped off
Maralen of the Mornsong Avatar Markov Purifier Mask of Griselbrand Miara, Thorn of the Glade My Genius Knows No Bounds Nafs Asp Necrodominance Necrologia Necropotence Nihilistic Glee Nurturing Peatland Oloro, Ageless Ascetic Phyrexian Etchings Power Taint Promise of Power Raiders' Spoils Rejuvenate Sanguine Spy Seymour Flux Shanna, Purifying Blade Shessra, Death's Whisper Silent Clearing Sinister Monolith Sphinx of the Revelation Staff of Compleation Stirge Street Wraith Sunbaked Canyon Susur Secundi, Void Altar Sylvan Library Syndicate Heavy Tenacious Underdog The Last Ride Tolarian Geyser Trading Post
As for the energies It looks at first sight that we will need a lot of them to keep attacking, right
A lot more ally-colour synergy cards show up in this set
Umbra armor's effect is applied no matter why the enchanted creature would be destroyed: because it's been dealt lethal damage, or because it's being affected by an effect that says to "destroy" it (such as Breathe Your Last)
Like attacking and activating other abilities, mana production is a vital part of the game