I was able to kill it with Immolation before it hit me, but that put him at 22 life
The Leylines are a set of enablers we didnt have in the original Theros block
Do this and you can play one of your big Younger Toguro characters with great ease with the most impactful play being into the powerhouse eight-cost behemoth that acts as just a six-cost when paired with this guy

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Just that there was an entire cycle of these convert colorless to a colored mana cards