Whenever you cast a Myr spell, Urtet gives you another Myr and all your Myr untap at the beginning of your combat step
Justice Strike can only outright kill creatures with a power equal to or greater than its toughness, of where there are plenty in Guilds of Ravnica
There are twelve different versions of cards from those five artworks
There's also a handful of other cards that increases power, mostly equipments like Champion's Helm, but most of these bump the power by about 2 and not enough to get most creatures to 7+ power
Since Hidden Strings can twiddle twice and untap your Voltaic Key, well, you can feel the shenanigans
The 10 Best Bloomburrow Cards for Timeless 10 - Frogmite Coming as a mythic-rare through Special Guests, Frogmite helps Affinity have a little more consistency, but it shouldn't have much of an impact on the Metagame given how much its deck has failed to find space in competitive Timeless