While you may have been brainwashed to see an Aura and think bad because card disadvantage, now is the time to free yourself from said brainwashing
Next is Blasting Station, Grinding Station, and Summoning Station, all three of which synergize well with either sacrificing artifacts or returning them to the battlefield
On to the activated ability, is a nice easy cost, and while the nonlegendary clause is sure to nip at you a couple of times for interactions you would love to have, there are lots of excellent targets for Niko to flicker and result in three or more extra white or blue ETB effects, just look at Karmic Guide, Trinket Mage, and Junk Winder
While we wait for the trade feature to come, you can now download Pokmon TCG Pocketwhich has everything you need to dip your toes into action
card management and character attacks, then advancing to more complex mechanics like timing, card advantage, and combo execution
Once you start bringing in untappers, things get seriously silly