Their power varies wildly based on strategy and format, so lets get out the jewelers loupe and take a look at these crystals
The fact that the tokens are non-legendary lets you jam cards like Old Gnawbone without worrying about the legend rule
7 Frontline Heroism Theres Plenty To Be Found A deceptively strong card that can quickly snowball out of control, Frontline Heroism is a three-mana enchantment that gives you a 1/1 red Soldier creature token with haste when it comes into play
On the plus side, in a typical BG graveyard-matters deck, you can effectively reanimate every turn

Heres my shortlist of noteworthy upgrade options, divided by price point rather than card function: $1 OR LESS OPTIONS Marionette Master, Armix, Filigree Thrasher, Gravebreaker Lamia, Disciple of the Vault, Voltaic Construct, Ill-Gotten Gains, Stinkweed Imp, Orbs of Warding, Silent Gravestone, Scourge of Nel Toth, Mimic Vat $10 OR LESS OPTIONS Priest of Yawgmoth, Staff of Domination, Crypt of Agadeem, Pili-Pala, Basalt Monolith, Bolass Citadel, Metalwork Colossus, Nettlecyst, Currency Converter, Grim Hireling, Ruthless Technomancer MORE THAN $10 OPTIONS Entomb, Reanimate, Altar of the Brood, Retrofitter Foundry, Cabal Coffers, Defense Grid, Blightsteel Colossus, Darksteel Forge, Revel in Riches, Pitiless Plunderer THEY PUT THE NASTY IN DYNASTY This precon has been one of the hardest to make upgrade recommendations for not because theres any shortage of good options, but because theres just too many equally strong directions to take the deck