As it stands right now, however, Dragapult ex seems to come out of rotation relatively unscathed
This card also combos well once you have one of your synchro Tenpai monsters on the field, as you can destroy Sangen Summoning to double the attack points of the Synchro Monster
Surge, Erika, or similar cards to execute key strategies, Shadowy Spellbind poses a major challenge, disrupting their momentum and limiting tactical options
And...they're highly impractical to use basically anywhere they appear, but let's talk about them anyhow
A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
They were forced to attack, but if they survived, you got to keep them