Malenia, Blade of Miquella

Triple strike (This creature deals first-strike, regular
and last-strike combat damage. Last-strike combat
damage is dealt after regular combat damage.)
Whenever Malenia, Blade of Miquella deals
combat damage, it gains Wither until end of
combat. If Malenia has Wither, it gains Infect
until end of combat instead.
"You should think about blocking this in some regard"
—Ryan the Consultant