I like Lukaminas mono-green specialized form to pair with Historic cards like Stonecoil Serpent, and its Gruul form to pair with Alchemy cards like Tovolar, Dire Overlord
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This becomes completely nullified if you need to pay mana to keep them around
Including ways to buff Shadowfax allows you to cheat out even bigger creatures each turn
This is rather unlikely to have the same issue, however, since the promo is not that interesting
Cons: Time-consuming (research, buying cards, testing), can get expensive if you dont set a budget, steeper learning curve for new players, and your first few brews might not be world-beaters