The general idea here is that each Boss card gives special abilities to the creatures included in the boss deck
Land recursion and the ability to play multiple lands can be great to mitigate the effect of Planetary Annihilation, while putting the other players behind in a not-too-aggressive or frustrating manner
This can be before blockers are declared, after blockers are declared but before combat damage is dealt, during combat after combat damage is dealt, during the postcombat main phase, during the end step, or, in some unusual cases, during the cleanup step
At the beginning of combat on your turn, attach any number of Equipment you control to target creature you control
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Say that you have a Lost Leonin on the board which has a power of 2 and the infect ability