The overall strategy is fairly straightforward: assemble an army of legendary hero creatures and support them with both equipment and counters with a lot of emphasis on the Legendary and Hero subtypes
You can also get hero-specific sleeves for some of your favourite heroes, including: How Many Sleeves Does Marvel Champions Need
Other effects that set its power to a specific value that start to apply after the ability resolves will overwrite that part of the effect
The ranks of the dorms in the Duel Academy, named after the Egyptian Gods, reflects how Seto Kaiba viewed the three cards: Slifer Red is the lowest rank, as "Slifer" was owned by Yugi Muto, his arch-rival
If Altered Ego somehow enters at the same time as another creature, Altered Ego can't become a copy of that creature
This pretty much goes without saying, but please do not rip