Deck F2P player friendly: no monsters, only recover life points, stall and inflict damage with Type Zero Magic Crusher. Use Dino DNA! for extra healing. 28 spells + 2 traps. Be sure to include 3x De-Spell and 3x Different Dimension Capsule.
Yup, any combo that can synchro summon the Wyvern in 1 turn is OK. The usage of Enemy Controller is for both attacking and defensive purpose (For 0 damage bonus). Yup, Shooting Star Bow - Ceal is a good option too. (P/S: I didn't have that card. >_<)
Terror Incarnate's damage effect is an activated effect, but it activates during a part of the Damage Step where most cards can't be used. (Counter Traps and Quick Effect Monsters that negate activations being the exceptions.)
Your worry about Nature's Reflection being the last card is easily fixed by running something like Temple of the Kings, Good Goblin Housekeeping or a second Reflection.