Usually, you need 20-30
When the first activation resolves, search for Moltensteel Dragon first, then pay 2 life or red mana six times to give it +6/+0 until the end of the turn
The Temples Ive never liked needing to play temples, but weve seen them appear in Standard a couple of times now, and a free scry is actually enough of an upside to want to play them
Marisi, Breaker of the Coils goad ability is also very powerful
There are a couple more designs I found super intriguing
On the other hand, while foil drop rates in normal Standard sets have increased recently, in the past, you'd open a foil mythic about one in every three boxes (and this might be being slightly generous), which means to open an original foil Theros printing of Heliod, God of the Sun, you'd have to open roughly 45 boxes of Theros, which means getting 50,000 copies would take 2,250,000 Theros booster boxes, which at $100 would add up to $225 million