It doesn't matter if more than two mana of that color was spent
first, the ability to destroy a number of spell and/or trap cards on the field, up to the number of hero monsters you control (not including Stratos), and second, searching any hero monster and adding it to your hand
Leveling comes with other rewards too such as additional deck-recipe slots, rare cards, or even just more Gold and Gems
I often carefully examine cards made by other Pokmon TCG official illustrators, and I sometimes make it a goal to reach their level
If you used Full of Gas last turn, its Crazy Bomb attack hits for 170 damage, shaking even the toughest ex Pokemon
As a longtime Soulflayer fan, I havent ever had the motivation to jump through the hoops to make it or similar cards work in Cube, and Indominus Rex is just easy mode in terms of offering that sort of play experience