The mana symbols appearing explicitly in the rules text, like Add mana instead of Tap to add 1 green mana. End of Mono/Poly artifacts: Calling these cards artifact became the norm, like what happened with the different kinds of enchantments
The price is also heavily tied to the specific artifacts on the bonus sheet within
Usually, regular holo rares feel more special than the average reverse holo, especially in modern sets
However, if the opposing creature has a toughness greater than 1, then Poison Dart Frog's attack would fail
Gain the upper hand by playing high-power Characters while using "ST04-004 King" and "OP01-096 King" to remove opposing threats, and "ST04-005 Queen" to replace cards in your hand
From there, it's likely real money will need to be exchanged to access more cards