Since these big hitters will likely be the highest HP Pokmon cards in the meta for a while, giving your opponent at least one swipe at them before you get to attack is a fair balancing mechanic that returns from the previous iteration of Mega Evolutions in 2016's XY Pokemon sets
These can include keyword abilities, like flying or deathtouch
Summon: Titan doesn't not only hit hard, but also generates mana advantage and pumps another creature before wearing out its welcome
Then, utilize those cards you discarded with creatures like Dreadwing Scavenger or Soul-Shackled Zombie
Once you have Prank-Kids Dodo-Doodle-Doo , you can use its first effect to get Prank-Kids Pandemonium from the deck and put it in your hand
Level 4 is the most common level for a non-tuner monster in the game, so having these level 4 tuners provides an incredibly easy way to synchro summon for level 8