Chandra Pyromancer, Torch of Defiance, the Firebrand 3.5 /4.5 / 3 Rishadan Port 7 Port is somewhat of the Stripmine that costs you twice as much to use but gives you the option on having the mana yourself back later
Similarly, permanents that phase out with counters phase in with those counters
That means the more your lone attacker grows, the more cards you filter through digging toward lands, answers, or payoffs while your threat gets bigger every turn
This should help the Ruby/Amethyst control deck continue to be a dominant deck within Lorcanas metagame
It's a mini-removal spell, letting you Shock something when it ETBs and then you can churn out some 3/3 Golems by trading in your weaker artifact, which seems fine but not great
Such a cheap, reliable source of card draw is hard to beat