yugioh abyss deck 1st Place RDQ! BURNING PROFILE Yu-Gi-Oh! - Complete Burning Abyss

And...they're highly impractical to use basically anywhere they appear, but let's talk about them anyhow

It was not born naturally

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

22 Families with children through age 5 years are invited to dance, sing and play with bubbles

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