Some questions regarding Phytohydra
1) when it blocks a creature with wither, does the Phytohydra get the +1/+1 counters instead of -1/-1 counters
2) does deathtouch kill Phytohydra?
3) If its 1/1 and it blocks a 2/4 creature with trample, does the trample creature have to assign 1 or 3 damage (which includes the counters the Phytohydra will recieve) as lethal damage?