Onkru, the Elementalist

Double strike.
Whenever Onkru, the Elementalist attacks, you
may tap an untapped Elemental you control. When
you do, if that creature is red, it gains afflict X until
end of turn, where X is Onkru's power. The same
applies for black and menace, blue and flying, green
and toxic 1, and white and lifelink. (Whenever this
creature has afflict and becomes blocked,
defending player loses X life. Meanwhile, when it
has toxic, players dealt combat damage by this
creature also get 1 poison counter.)