Interestingly, only Steel characters have the new keyword among their traits while some Sapphire characters or actions can grant this effect to other characters
While the engine at the heart of the deck was Cadaverous Bloom it would not have been even remotely competitive without Squandered Resources, as banning this card proved
In fact, she likes it so much, she has an ability called Symphony of Pain
This, combined with a lot of greedy enchantment effects like Doubling Season being rather popular means that Dockside Extortionist can easily come down and generate tons of Treasure

The format looks substantially different and continues to forge into new territory: Selesnya Company $778 [MTGO: 218 Tix][MTGA: 15 Mythic, 46 Rare, 2 Uncommon, 12 Common] Golgari Midrange: $765 [MTGO: 199 Tix][MTGA: 14 Mythic, 39 Rare, 13 Uncommon, 9 Common] Sultai Scapeshift: $729 [MTGO: 151 Tix][MTGA: 10 Mythic, 39 Rare, 15 Uncommon, 11 Common] Rakdos Midrange $689 [MTGO: 60 Tix][MTGA: 11 Mythic, 41 Rare, 12 Uncommon, 11 Common] Niv to Light: $534 [MTGO: 36 Tix][MTGA: 21 Mythic, 57 Rare, 12 Uncommon, 5 Common] Abzan Greasefang $403 [MTGO: 78 Tix][MTGA: 9 Mythic, 43 Rare, 10 Uncommon, 13 Common] Hidden Strings $383 [MTGO: 97 Tix][MTGA: 8 Mythic, 41 Rare, 18 Uncommon, 9 Common] Azorius Control $366 [MTGO: 77 Tix][MTGA: 11 Mythic, 48 Rare, 13 Uncommon, 4 Common] Jund Sacrifice: $280 [MTGO: 55 Tix][MTGA: 10 Mythic, 29 Rare, 27 Uncommon, 9 Common] Izzet Phoenix $207 [MTGO: 157 Tix][MTGA: 7 Mythic, 27 Rare, 16 Uncommon, 25 Common] Its important to note that Pioneer is available on Arena