9 Giant Slug This card game has experimented with a lot of different mechanics and effects since the early days, and Wizards of the Coast really underestimated some effects (card draw, extra mana) while overestimating others
Full Throttle: Any extra combat type card can fit, but Full Throttles 2 extra combat phases give you the opportunity to wipe the table out in one turn
Unable to control it, the Wanderer planeswalked away, disappearing from Kamigawa, no one knowing where she went
I could work with that and was relatively sure I wasn't going to run headlong into a Vandalblast in our TTS game
That said, preparing Kirol is a relatively unexciting gravebreak trigger, and the extra mana might be better spent on something elselike playing a card you recurred from the graveyard or casting a spell with flashback to trigger a more impactful synergy