Rivendell

Whenever you cast a green spell and whenever a Forest you control enters, put a +1/+1 counter on target creature you control. T: Add G.

T: Add C. T: Add one mana of any color. Spend this mana only to cast a legendary spell, and that spell can't be countered.

As The Black Gate enters, you may pay 3 life. If you don't, it enters tapped. T: Add B. 1B, T: Choose a player with the most life or tied for most life. Target creature can't be blocked by creatures that player controls this turn.

Ward—Discard an enchantment, instant, or sorcery card. Whenever you cast your second spell each turn, each opponent mills two cards. When one or more cards are milled this way, exile target enchantment, instant, or sorcery card with equal or lesser mana value than that spell from an opponent's graveyard. Copy the exiled card. You may cast the copy without paying its mana cost.

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Whenever equipped creature attacks, put a +1/+1 counter on each creature you control. If you have the city's blessing, put two +1/+1 counters on each creature you control instead. Equip 3

Flash Indestructible When Mithril Coat enters, attach it to target legendary creature you control. Equipped creature has indestructible. Equip 3

Equipped creature has first strike and gets +1/+0 for each instant and sorcery card in your graveyard. Whenever equipped creature deals combat damage to a player, you may cast an instant or sorcery spell from your hand with mana value less than or equal to that damage without paying its mana cost. Equip 3

Draw three cards. Islandcycling 1 (1, Discard this card: Search your library for an Island card, reveal it, put it into your hand, then shuffle.)