You choose targets for that ability as it goes on the stack
Generally, a card that gives you rewards for doing what you were going to do anyway is good, and Sisu is exactly that
The downside is that thanks to the Not Without My Family ability, you cant actually play Mirabel without having five or more characters in play already
Once players get comfortable with the game, they can start building their own decks rather than just using the pre-made starters
Shantotto, Tactician Magician (FIN-241) - FINAL FANTASY Shantotto, Tactician Magician (FIN-241) - FINAL FANTASY Wizards of the Coast Whenever you cast a noncreature spell, Shantotto gets +X/+0 until end of turn, where X is the amount of mana spent to cast that spell
That said, getting a flashback option that will slide comfortably into decks that want to keep wheeling and filling the yard is nice, and Snort will do that for you