For that, you're getting literal free mana since the card has no mana cost but taps for mana, so long as you control a dragon
Rather than healing 20 HP, it increases your cards total HP by 20, which in some cases can prevent your Pokmon from getting knocked out in a single hit
You can obtain the Mantyke (1-Star Shiny rarity) card by opening Fantastical Parade from Fantastical Parade set
Meanwhile, back in 2005, there was no card more broken than Umezawa's Jitte, with the equipment dominating the battlefield in harshly punishing decks that were built around small creatures, which is why it remains banned in Modern to this day
That said, the low equip cost and the permanent power boost via +1/+1 counters make it feel like it grants the equipped creature Super Prowess
Overall, Master Duel is the more hassle-free gacha experience