It's simpler for a creature to become indestructible until end of turn to protect it from lethal damage and destroy effects, achieving the same goal as regeneration but without the rules baggage.
GR Gold Rare Counter Gate X TRAP When an opponent's monster declares a direct attack: Negate the attack, and if you do, draw 1 card, then if it is a monster, immediately after this effect resolves, you can Normal Summon it in face-up Attack Position
It can't be blocked that combat.
At the end of a player's turn, they untapped all of their lands, giving them most of their mana sources back for the other player's turn
Summon: Primal Odin I don't know if this card will be as good as I imagine it can be, but you have to take a serious look at any creature than can kill your opponent in one attack
If you find yourself wanting that extra extension and willing to give up an additional card in your opening hand, then feel free to