Like everyone else I just saw a poor mans Birthing Pod at a casting cost that seemed too high for the format
Jumpstart is being sold 20 cards at a time, but theres a catch: All the cards inside each pack align with a specific theme
Training Grounds just happens to be the commander-dependent version of this maximization, so while it wont directly make you more mana or draw you more cards it most certainly will be helping your commander to get you there
The back of a flip card is the normal _Magic: The Gathering_(R) card back
4 Rusko, Clockmaker Life Drain With Extra Mana And Blink Synergy Rusko, Clockmaker seems like a weak card in terms of mana costs and abilities, but is surprisingly reliable and can be used to completely control the game soon after it lands on the battlefield
At most you'll get an extra four +1/+1 counters, though you could just ignore the snow part of this card altogether and still get the card draw benefit