About finding rare cards, there may be some trick out there that hasn't been found yet or may be added in the future
Yes, sure, it can go into any green deck and start putting counters on things, but to get the real synergies with this going, you need to be in a dedicated +1/+1 Counters deck
Raul lets you cast one self-Milled card from your graveyard each turn, turning the likes of The Ancient One and Millstone into efficient card advantage generators
Auntie Blyte, Bad Influence The +1/+1 counters stack up by the same amount of damage you took, so the ultra-rare flying on a red card with no drawback becomes really important and quickly makes a lethal threat out of Auntie Blyte, Bad Influence
The biggest strength that Centiskorch was lacking prior to the addition of Silvally GX was the resilience to draw out of a Reset Stamp to a low hand size
Reddit user CurdledART has created his own version of the Fortnite map which re-introduces several POIs that have been removed from the map