Happy Little Gathering Evolving Wilds Sacrificing Evolving Wilds to fetch a basic land has long been one of the simplest and most reliable ways to fix mana
No other drawbacks here
The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, protection, reach, trample, and vigilance
The app takes advantage of the virtual nature of the cards by expanding the cards' artwork beyond the physical space
A nice backup win condition I like as well is Magistrate's Scepter + Tekuthal, Inquiry Dominus + Contagion Engine for infinite turns (if Scepter has a charge counter on it, activated the Engine to put 4 more counters on the Scepter then activate the Scepter to take an extra turn and repeat this infinite times)
This card comes in two versions: a reverse holo and a cosmos holo version