Before we get into that, lets talk about some of the sets themes and the bigger picture
Yes, mana myr can be solid, and bombs are there, but given all the sets to choose from, you'd be smart to stay away
They are in most decks that can run them, even decks with no need of the fixing sometimes run them, be it for the thinning, the graveyard filling, or the shuffles
Tapping Creatures To Reduce Harmonize Costs Whenever you pay the mana cost to cast a spell using its harmonize ability, you can reduce the cost by tapping a creature you control
This was released in December 2015 as a freemium game and continues to be updated with new card sets from the physical game