Link Arrows do two things, they enable effects for the Link Monster to activate or make it stronger, for example Decode Talker gains 500 ATK for each monster it points to and is able negate card effects that target cards you control by Tributing a monster it points to
Lost Wind X TRAP Target 1 face-up Special Summoned monster on the field
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The only downside to it, I would say, is that it is level 7, therefore it doesn't XYZ into Cyber Dragon Nova unless you use Drei (Which shouldn't be a problem since you could still Normal Summon it), but I think it balances out, with the massive XYZ potential this card lays out by itself
Last time I checked, free is pretty good
Toxic has creatures deal damage as normal, then inflict an amount of poison counters on top of that