In this case, the spell side provides an infinite-hand-size emblem while drawing you lots of cards, and the Sea Gate, Reborn side is an untapped mana source if needed early on
Attacking is the easiest way to tap Sanwell, but you could also tap it to crew a vehicle and get the opportunity to play something on another players turn, as the ability ignores timing restrictions
Or, if you don't have the card, you can use: The official Magic: The Gathering website
Timetwister enables loops and happens to be blue, but Wheel of Fortune leaves your graveyard intact and interacts with discard payoffs
Invasion of Gobakhan is an elite sideboard option against slower strategies and combo decks, especially those with access to board wipes
Stonebrow, Krosan Hero Stonebrow, Krosan Hero can be a great addition to an aggro deck, even an interesting Gruul commander