Once you stack Ultimate Hunter Daisy joins your team as a 6th player. She has 1 min duration and 1 min Cooldown. Summon her before fights to give her 25% MS bonus for 5 sec. Daisy scaling is ridiculous. All her stats scale with Ivern's Ap and your R level gives her some pretty insane bonuses - especially level 16, when she randomly gets +50 Armor & Magic Resist (for a total of 90 without AP bonus) and 70 AD (for a total of 170 without AP bonus). When you build AP, Daisy has Health and Resistances of a tank, auto damage of an AD champion and a 3 sec cd skill that knocks up enemies in a line for 1 sec dealing 50% Ap + Daisy base AD damage (70/100/170). Daisy also benefits from your Q dash and is often a great target for your E, which has 80% AP ratio on both the shield and AOE damage. To put into perspective how strong Daisy is, I have had a lategame support Daisy solo kill an Irelia mid from 100% hp (I had over 500 Ap).

-Use your W to check bushes,your bushes grant you vision of the area for 3 sec.
-Your Q, dash, E into explosion slow on both enemies make for a very strong lvl 2 engage and it is very easy to follow up. You gave your ADC a dash, rooted an enemy and then slowed both enemies. Always look for that lvl 2 powerspike and to get that lvl 2 first. Exhaust + Nimbus Cloak make the play even easier.
-Fight at level 2 or when your R is ready. If you don't get bursted down, Daisy is a separate champion and you get to fight 3 vs 2. Play around R power spikes as they are very very strong (ex. base stats comparisons: lvl 6 Daisy -> 1250 hp; lvl 11 Daisy -> 2500 hp; lvl 11 Daisy 40 Ar/Mr 100 Ad; lvl 16 Daisy 90 Ar/Mr 170 Ad).
-You can't leash, so don't bother trying.